Re: [PHP] Delete
On 6/4/06, Larry Garfield <[EMAIL PROTECTED]> wrote: Make each button a separate form, with the id as a hidden value. Like so: My first entry [snip] You may find it easier to generate links of the form delete.php?id=1, etc. Then you won't have to use a seperate form for each link. The id will be available in delete.php in $_GET. The same sanity checking applies in this case too. Rabin -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] How do I make a HTML tree for a set of nodes?
Hi, I have a set of nodes. Each node has a parent and so the set can be thought of as a tree. I want to show that tree somehow on a webpage, served by PHP. I cannot use Dot/Graphwiz for various reasons. What I'm looking for is an output of DIVs or tablecells, showing the nodes and their connections. It's not a trivial task, IMO, but doable. Possibly somebody has already made something similiar, but I can't find anything on Google. Can anybody point me to helpful information? Thanks, Niels -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Delete
At 10:53 PM -0700 6/3/06, George Babichev wrote: >Thank you for the help guys, but the I guess I kinda have another question. >So I do assign an id to each blog post, and it is auto_increment, so in my >blog delete page, it would display all the blog title's and a delete button >nex to it. So lets say I click delete on the third entry. How would my >program know to delete THAT entry and not another one? Your specific question of "how to delete" I am sure other will provide, but consider this idea. If you have a page that shows blog entries, then why not have an admin page that shows exactly the same thing except if has check-boxes next to the posts? And, if you check any of those and click "Submit", then those entries will be deleted from the database -- simple, plus you already have most of the code. :-) I had a similar problem and was designing an admin page that would do the things I wanted (add/delete/alter items) when it dawned on me that all I needed was a check-box and a submit button added to my main display page. As to how to delete and such, you may find this useful: http://www.weberdev.com/get_example-384.html hth's tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
At 2:07 PM +0200 6/4/06, Niels wrote: >Hi, > > >I have a set of nodes. Each node has a parent and so the set can be thought >of as a tree. I want to show that tree somehow on a webpage, served by PHP. >I cannot use Dot/Graphwiz for various reasons. What I'm looking for is an >output of DIVs or tablecells, showing the nodes and their connections. It's >not a trivial task, IMO, but doable. Possibly somebody has already made >something similiar, but I can't find anything on Google. Can anybody point >me to helpful information? > >Thanks, >Niels What, a binary-tree or linked-list sort of thing? tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
On Sunday 04 June 2006 14:58, tedd wrote: > At 2:07 PM +0200 6/4/06, Niels wrote: >>Hi, >> >> >>I have a set of nodes. Each node has a parent and so the set can be >>thought of as a tree. I want to show that tree somehow on a webpage, >>served by PHP. I cannot use Dot/Graphwiz for various reasons. What I'm >>looking for is an output of DIVs or tablecells, showing the nodes and >>their connections. It's not a trivial task, IMO, but doable. Possibly >>somebody has already made something similiar, but I can't find anything on >>Google. Can anybody point me to helpful information? >> >>Thanks, >>Niels > > > What, a binary-tree or linked-list sort of thing? > > tedd Not binary -- a node can have several children. Each node has an id and a parentId. The actual structure isn't important and can easily be objects, arrays-of-arrays or whatever is handy. //Niels -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
At 3:03 PM +0200 6/4/06, Niels wrote: >On Sunday 04 June 2006 14:58, tedd wrote: > >> At 2:07 PM +0200 6/4/06, Niels wrote: >>>Hi, >>> >>> >>>I have a set of nodes. Each node has a parent and so the set can be >>>thought of as a tree. I want to show that tree somehow on a webpage, >>>served by PHP. I cannot use Dot/Graphwiz for various reasons. What I'm >>>looking for is an output of DIVs or tablecells, showing the nodes and >>>their connections. It's not a trivial task, IMO, but doable. Possibly >>>somebody has already made something similiar, but I can't find anything on >>>Google. Can anybody point me to helpful information? >>> >>>Thanks, >>>Niels >> >> >> What, a binary-tree or linked-list sort of thing? >> >> tedd > >Not binary -- a node can have several children. Each node has an id and a >parentId. The actual structure isn't important and can easily be objects, >arrays-of-arrays or whatever is handy. > >//Niels You can dynamically generate a table and place text (and/or color) the cells that are nodes -- that would be my approach. You would need to know the width and depth of the tree and then just fill in the cells that are nodes. hth's tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
On Sunday 04 June 2006 15:30, tedd wrote: [snip] > You can dynamically generate a table and place text (and/or color) the > cells that are nodes -- that would be my approach. You would need to know > the width and depth of the tree and then just fill in the cells that are > nodes. > > hth's > > tedd Yes, well... It's a tad more complicated I think. Yes, I can make a table, finding the dimensions shouldn't be a big problem. Placing the nodes in the right cells isn't as easy, and making the connections is downright difficult. A problem with using a table is that cells can't be individually sized. However DIVs or TDs is a minor problem. The major problem is to walk through the tree properly (recursively probably), and remember the connections. And then rendering them... Thank you for your answer, Niels -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
2006/6/4, Niels <[EMAIL PROTECTED]>: Hi, I have a set of nodes. Each node has a parent and so the set can be thought of as a tree. I want to show that tree somehow on a webpage, served by PHP. I cannot use Dot/Graphwiz for various reasons. What I'm looking for is an output of DIVs or tablecells, showing the nodes and their connections. It's not a trivial task, IMO, but doable. Possibly somebody has already made something similiar, but I can't find anything on Google. Can anybody point me to helpful information? Thanks, Niels -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php I had a similar problem that, although it was with a binary tree, it can be used with your tree. PHP doesn't like too much the use of recursion, but this time recursion is the way to go (if you want to keep the code maintainable). Hopefully the tree will not span deep enough to cause any problems... (hopefully). The function will receive a node and return a table representation of the branch started by this tree, if you point this function to the root node you'll have your table. In each cell it will have to indicate whether it is empty, it has a node or a line connecting neighbor cells. One important thing to define here is the way the function will organize the nodes in the table, in my function the root node was at the top in the center. First, the trivial case: if the node doesn't have children return a table with one cell, the node itself. Then, the recursive case: if the node have children, call the function with those nodes and store the tables returned. According to the representation I used, it calculated the combined width of those tables, created a new table where the first row contained the parent node centered, the second line an horizontal line from the column where the first children would be to the column where the last children would be. Then it build the rest of the table pasting together, horizontally, the tables of the children. Voila! a nice table representation of the tree.
Re: [PHP] How do I make a HTML tree for a set of nodes?
You could do it by dynamically generating an image. Mike Niels wrote: On Sunday 04 June 2006 15:30, tedd wrote: [snip] You can dynamically generate a table and place text (and/or color) the cells that are nodes -- that would be my approach. You would need to know the width and depth of the tree and then just fill in the cells that are nodes. hth's tedd Yes, well... It's a tad more complicated I think. Yes, I can make a table, finding the dimensions shouldn't be a big problem. Placing the nodes in the right cells isn't as easy, and making the connections is downright difficult. A problem with using a table is that cells can't be individually sized. However DIVs or TDs is a minor problem. The major problem is to walk through the tree properly (recursively probably), and remember the connections. And then rendering them... Thank you for your answer, Niels
Re: [PHP] How do I make a HTML tree for a set of nodes?
On Sunday 04 June 2006 18:37, Mike Bellerby wrote: > You could do it by dynamically generating an image. > > Mike [snip] Yes. But how? I've settled for a simpler solution -- see my answer to Martin Alterisio. Thanks, Niels -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
Hi!
On Sunday 04 June 2006 18:13, Martin Alterisio wrote:
[snip]
> I had a similar problem that, although it was with a binary tree, it can
> be used with your tree. PHP doesn't like too much the use of recursion,
> but this time recursion is the way to go (if you want to keep the code
> maintainable). Hopefully the tree will not span deep enough to cause any
> problems... (hopefully).
>
> The function will receive a node and return a table representation of the
> branch started by this tree, if you point this function to the root node
> you'll have your table. In each cell it will have to indicate whether it
> is empty, it has a node or a line connecting neighbor cells. One important
> thing to define here is the way the function will organize the nodes in
> the table, in my function the root node was at the top in the center.
>
> First, the trivial case: if the node doesn't have children return a table
> with one cell, the node itself.
> Then, the recursive case: if the node have children, call the function
> with those nodes and store the tables returned. According to the
> representation I used, it calculated the combined width of those tables,
> created a new table where the first row contained the parent node
> centered, the second line an horizontal line from the column where the
> first children would be to the column where the last children would be.
> Then it build the rest of the table pasting together, horizontally, the
> tables of the children. Voila! a nice table representation of the tree.
This sounds fine -- recursion is obviously the way to go. Where can I see
your function?
I tried several different solutions over the last couple of hours, and I've
settled on only using indentation (like a nested list), not a
fancy graph with antialised branches. It's the simplest possible recursion
but I like the results, even if it's a bit harder to grasp without
connections clearly marked.
function tree($nodes, $start, $indent=-30) {
$indent+=30;
global $tree;
foreach ($nodes as $nodeID => $node) {
if ($node['parent']!=$start) {continue;}
$tree.="{$node['name']}";
tree($nodes, $nodeID, $indent);
}
return $tree;
}
Thanks!
//Niels
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[PHP] Re: How do I make a HTML tree for a set of nodes?
Well, if you're asking for some recommendation on how to show it, I would suggest to use lists (either ordered -OL- or unordered -UL- depends on you), or maybe even data-lists (DL), so you would get +- parent 1 | +- child 1 | \- child 2 +- parent 2 \- sub-parent1 +- sub-child 1 \- sub-child 2 into something like parent 1 child 1 child 2 parent 2 sub-parent 1 sub-child 1 sub-child 2 Now, if you're asking for code, send what you've tried so far, and maybe someone will be able to help you (either correcting your code, or sending another way to do it) Niels wrote: I have a set of nodes. Each node has a parent and so the set can be thought of as a tree. I want to show that tree somehow on a webpage, served by PHP. I cannot use Dot/Graphwiz for various reasons. What I'm looking for is an output of DIVs or tablecells, showing the nodes and their connections. It's not a trivial task, IMO, but doable. Possibly somebody has already made something similiar, but I can't find anything on Google. Can anybody point me to helpful information? -- Atentamente / Sincerely, J. Rafael Salazar Magaña -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
2006/6/4, Niels <[EMAIL PROTECTED]>:
Hi!
On Sunday 04 June 2006 18:13, Martin Alterisio wrote:
[snip]
> I had a similar problem that, although it was with a binary tree, it can
> be used with your tree. PHP doesn't like too much the use of recursion,
> but this time recursion is the way to go (if you want to keep the code
> maintainable). Hopefully the tree will not span deep enough to cause any
> problems... (hopefully).
>
> The function will receive a node and return a table representation of
the
> branch started by this tree, if you point this function to the root node
> you'll have your table. In each cell it will have to indicate whether it
> is empty, it has a node or a line connecting neighbor cells. One
important
> thing to define here is the way the function will organize the nodes in
> the table, in my function the root node was at the top in the center.
>
> First, the trivial case: if the node doesn't have children return a
table
> with one cell, the node itself.
> Then, the recursive case: if the node have children, call the function
> with those nodes and store the tables returned. According to the
> representation I used, it calculated the combined width of those tables,
> created a new table where the first row contained the parent node
> centered, the second line an horizontal line from the column where the
> first children would be to the column where the last children would be.
> Then it build the rest of the table pasting together, horizontally, the
> tables of the children. Voila! a nice table representation of the tree.
This sounds fine -- recursion is obviously the way to go. Where can I see
your function?
I tried several different solutions over the last couple of hours, and
I've
settled on only using indentation (like a nested list), not a
fancy graph with antialised branches. It's the simplest possible recursion
but I like the results, even if it's a bit harder to grasp without
connections clearly marked.
function tree($nodes, $start, $indent=-30) {
$indent+=30;
global $tree;
foreach ($nodes as $nodeID => $node) {
if ($node['parent']!=$start) {continue;}
$tree.="{$node['name']}";
tree($nodes, $nodeID, $indent);
}
return $tree;
}
Thanks!
//Niels
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Sorry, I can't show you the code. Anyway you don't seem to need it. One
recommendation, don't rely on global vars, look at this:
function tree($nodes, $start, $indent=-30) {
$indent+=30;
$tree = "";
foreach ($nodes as $nodeID => $node) {
if ($node['parent']!=$start) {continue;}
$tree .= "{$node['name']}";
$tree .= tree($nodes, $nodeID, $indent);
}
return $tree;
}
Re: [PHP] How do I make a HTML tree for a set of nodes?
At 3:38 PM +0200 6/4/06, Niels wrote: >On Sunday 04 June 2006 15:30, tedd wrote: > >[snip] > >> You can dynamically generate a table and place text (and/or color) the >> cells that are nodes -- that would be my approach. You would need to know >> the width and depth of the tree and then just fill in the cells that are >> nodes. >> >> hth's >> >> tedd > >Yes, well... It's a tad more complicated I think. Yes, I can make a table, >finding the dimensions shouldn't be a big problem. Placing the nodes in the >right cells isn't as easy, and making the connections is downright >difficult. > >A problem with using a table is that cells can't be individually sized. >However DIVs or TDs is a minor problem. The major problem is to walk >through the tree properly (recursively probably), and remember the >connections. And then rendering them... I've done this before, but not with html. My demo is at: http://www.sperling.com/freeware.php So, I have an idea of what's involved. If this just for display, then it shouldn't be too difficult to display the end results in a table -- provided, you know in advance the largest any row will be. It will be a simple grid, unless you want to play with column spacing, which will be very difficult indeed to manage. As for cells not being individually sized, you're right they can't be sized, but they do automatically size to their contents and that can be varied as well shown with different background colors. Are you going to use this for something other than display, is it functional in some way? Because if you're going to add functionality, such as editing, deleting, sorting, then you have a big chore in front of you. As for using recursive functions, absolutely -- they make the process (and code) much less. However, you need to wrap your mind around things spinning around to their conclusion, which is sometimes difficult to imagine. Good luck. tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
Hi, On Sunday 04 June 2006 19:02, Martin Alterisio wrote: [snip] > Sorry, I can't show you the code. Anyway you don't seem to need it. One > recommendation, don't rely on global vars, look at this: Quite right, I'd have gotten around to fixing that later. Thank you for your answer, I appreciate it! Niels -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Delete
On Sunday 04 June 2006 03:11, Rabin Vincent wrote: > On 6/4/06, Larry Garfield <[EMAIL PROTECTED]> wrote: > > Make each button a separate form, with the id as a hidden value. Like > > so: > > > > > > > > My first entry > > > > > > > > > > [snip] > > You may find it easier to generate links of the form > delete.php?id=1, etc. Then you won't have to use a seperate > form for each link. The id will be available in delete.php > in $_GET. The same sanity checking applies in this case too. > > Rabin Only if delete.php is a confirmation page. Never ever ever have a delete function that operates solely by GET. Here's why: http://thedailywtf.com/forums/thread/66166.aspx :-) -- Larry Garfield AIM: LOLG42 [EMAIL PROTECTED] ICQ: 6817012 "If nature has made any one thing less susceptible than all others of exclusive property, it is the action of the thinking power called an idea, which an individual may exclusively possess as long as he keeps it to himself; but the moment it is divulged, it forces itself into the possession of every one, and the receiver cannot dispossess himself of it." -- Thomas Jefferson -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
Hi, On Sunday 04 June 2006 19:08, tedd wrote: > At 3:38 PM +0200 6/4/06, Niels wrote: >>On Sunday 04 June 2006 15:30, tedd wrote: >> >>[snip] >> >>> You can dynamically generate a table and place text (and/or color) the >>> cells that are nodes -- that would be my approach. You would need to >>> know the width and depth of the tree and then just fill in the cells >>> that are nodes. >>> >>> hth's >>> >>> tedd >> >>Yes, well... It's a tad more complicated I think. Yes, I can make a table, >>finding the dimensions shouldn't be a big problem. Placing the nodes in >>the right cells isn't as easy, and making the connections is downright >>difficult. >> >>A problem with using a table is that cells can't be individually sized. >>However DIVs or TDs is a minor problem. The major problem is to walk >>through the tree properly (recursively probably), and remember the >>connections. And then rendering them... > > I've done this before, but not with html. > > My demo is at: > > http://www.sperling.com/freeware.php > > So, I have an idea of what's involved. > > If this just for display, then it shouldn't be too difficult to display > the end results in a table -- provided, you know in advance the largest > any row will be. It will be a simple grid, unless you want to play with > column spacing, which will be very difficult indeed to manage. > > As for cells not being individually sized, you're right they can't be > sized, but they do automatically size to their contents and that can be > varied as well shown with different background colors. > > Are you going to use this for something other than display, is it > functional in some way? Because if you're going to add functionality, such > as editing, deleting, sorting, then you have a big chore in front of you. > > As for using recursive functions, absolutely -- they make the process (and > code) much less. However, you need to wrap your mind around things > spinning around to their conclusion, which is sometimes difficult to > imagine. > > Good luck. > > tedd Thank you for your answer, I appreciate it! Years ago I made Javascript navigation tree -- like a file browser, with expandable branches and so on. It was a big problem to parse all the relationships to img tags and links. I just had a looks at that code -- 10 years old, and it works! I couldn't change it to my current needs though. As I said elsewhere on this thread, I've settled for a simple, indented tree-view. Each node is a link and some text, and it's all reasonably easy to understand. And it's a small function -- I know about the dangers of recursion. Choosing this simple layout will also make it easier to render the output to PDF at a later stage. If I were to make a "real" tree, I wouldn't use a table. It's too difficult to manage IMO. I'd probably look for a generic graph algorithm somewhere, and try some dhtml voodoo with flying DIVs. Thanks again, Niels -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Delete
Yes, that checkbox idea is exactly what I was thinking about. Exept I have no idea how my program would tell one checkbox from the other, and delete the wrong thing... On 6/4/06, tedd <[EMAIL PROTECTED]> wrote: At 10:53 PM -0700 6/3/06, George Babichev wrote: >Thank you for the help guys, but the I guess I kinda have another question. >So I do assign an id to each blog post, and it is auto_increment, so in my >blog delete page, it would display all the blog title's and a delete button >nex to it. So lets say I click delete on the third entry. How would my >program know to delete THAT entry and not another one? Your specific question of "how to delete" I am sure other will provide, but consider this idea. If you have a page that shows blog entries, then why not have an admin page that shows exactly the same thing except if has check-boxes next to the posts? And, if you check any of those and click "Submit", then those entries will be deleted from the database -- simple, plus you already have most of the code. :-) I had a similar problem and was designing an admin page that would do the things I wanted (add/delete/alter items) when it dawned on me that all I needed was a check-box and a submit button added to my main display page. As to how to delete and such, you may find this useful: http://www.weberdev.com/get_example-384.html hth's tedd -- http://sperling.com http://ancientstones.com http://earthstones.com
[PHP] When is "z" != "z" ?
Hi gang:
Here's your opportunity to pound me again for not knowing the basics of php.
I vaguely remember something like this being discussed a while back, but can't
find the reference.
In any event, if one uses --
for ($i="a"; $i<"z"; $i++)
{
echo($i);
}
-- it stops at "y"
But, if you use --
for ($i="a"; $i<="z"; $i++)
{
echo($i);
}
-- it prints considerably more characters after "z" than what one would
normally expect -- why is that?
Just stopping at "z" would seem to make more sense, wouldn't it? After all,
when $i = "z" in the first expression, then wouldn't $i be equal to "z" in the
second expression and thus halt the operation?
What am I missing here?
Thanks.
tedd
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Re: [PHP] Delete
At 10:30 AM -0700 6/4/06, George Babichev wrote: >Yes, that checkbox idea is exactly what I was thinking about. Exept I have no >idea how my program would tell one checkbox from the other, and delete the >wrong thing... George: You're going to have to play around with forms and find out how check-boxes work. One you can figure out how to pass a confirm/not-confirm via a list of check-boxes, then we can proceed to the next step. tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
At 7:26 PM +0200 6/4/06, Niels wrote: >If I were to make a "real" tree, I wouldn't use a table. It's too difficult >to manage IMO. I'd probably look for a generic graph algorithm somewhere, >and try some dhtml voodoo with flying DIVs. > > >Thanks again, >Niels Niels: The below link may not at first look like what you're after, but belive me, you'll find stuff that will make you think how you can use it to do what you want. http://www.cssplay.co.uk/index.html Happy exploring. Using a combination of css and php will do what you want, I'm sure of it. tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] How do I make a HTML tree for a set of nodes?
On Sunday 04 June 2006 19:49, tedd wrote: > At 7:26 PM +0200 6/4/06, Niels wrote: >>If I were to make a "real" tree, I wouldn't use a table. It's too >>difficult to manage IMO. I'd probably look for a generic graph algorithm >>somewhere, and try some dhtml voodoo with flying DIVs. >> >> >>Thanks again, >>Niels > > Niels: > > The below link may not at first look like what you're after, but belive > me, you'll find stuff that will make you think how you can use it to do > what you want. > > http://www.cssplay.co.uk/index.html > > Happy exploring. Very cool!!! I've also started using the Javascript library from http://script.aculo.us/ -- that certainly saves me a lot of headaches. > Using a combination of css and php will do what you want, I'm sure of it. I want world peace... Thanks again, Niels -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
tedd wrote:
Hi gang:
Here's your opportunity to pound me again for not knowing the basics of php.
I vaguely remember something like this being discussed a while back, but can't
find the reference.
In any event, if one uses --
for ($i="a"; $i<"z"; $i++)
{
echo($i);
}
-- it stops at "y"
But, if you use --
for ($i="a"; $i<="z"; $i++)
{
echo($i);
}
-- it prints considerably more characters after "z" than what one would
normally expect -- why is that?
Just stopping at "z" would seem to make more sense, wouldn't it? After all, when $i = "z"
in the first expression, then wouldn't $i be equal to "z" in the second expression and thus halt
the operation?
What am I missing here?
It's a bit of a quirk. "z"++ is "aa" and "aa" < "z". I would guess
this would loop until until just before "za" which would be "yz".
It's a bit like looping through the hexadecimal characters. You would
have the same effect. However instead of being base-16 with 0-9-a-f you
have base-26 using a-z.
-Rasmus
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Re: [PHP] When is "z" != "z" ?
2006/6/4, Rasmus Lerdorf <[EMAIL PROTECTED]>:
tedd wrote:
> Hi gang:
>
> Here's your opportunity to pound me again for not knowing the basics of
php.
>
> I vaguely remember something like this being discussed a while back, but
can't find the reference.
>
> In any event, if one uses --
>
> for ($i="a"; $i<"z"; $i++)
> {
> echo($i);
>}
>
> -- it stops at "y"
>
> But, if you use --
>
> for ($i="a"; $i<="z"; $i++)
> {
> echo($i);
>}
>
> -- it prints considerably more characters after "z" than what one would
normally expect -- why is that?
>
> Just stopping at "z" would seem to make more sense, wouldn't it? After
all, when $i = "z" in the first expression, then wouldn't $i be equal to "z"
in the second expression and thus halt the operation?
>
> What am I missing here?
It's a bit of a quirk. "z"++ is "aa" and "aa" < "z". I would guess
this would loop until until just before "za" which would be "yz".
What?
"z"++ < "z" returns true? =S
Is there a reason for this? Why aren't they handled like C chars?
It's a bit like looping through the hexadecimal characters. You would
have the same effect. However instead of being base-16 with 0-9-a-f you
have base-26 using a-z.
0xF++ would be 0x10 which is greater than 0xF (0xF < 0x10). It's not the
same.
-Rasmus
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Re: [PHP] How do I make a HTML tree for a set of nodes?
At 8:00 PM +0200 6/4/06, Niels wrote: > > >> Using a combination of css and php will do what you want, I'm sure of it. >I want world peace... Well, if we were all programming php, we wouldn't have any war, but we wouldn't have any peace either. :-) tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
Martin Alterisio wrote:
2006/6/4, Rasmus Lerdorf <[EMAIL PROTECTED]>:
tedd wrote:
> Hi gang:
>
> Here's your opportunity to pound me again for not knowing the basics of
php.
>
> I vaguely remember something like this being discussed a while back,
but
can't find the reference.
>
> In any event, if one uses --
>
> for ($i="a"; $i<"z"; $i++)
> {
> echo($i);
>}
>
> -- it stops at "y"
>
> But, if you use --
>
> for ($i="a"; $i<="z"; $i++)
> {
> echo($i);
>}
>
> -- it prints considerably more characters after "z" than what one would
normally expect -- why is that?
>
> Just stopping at "z" would seem to make more sense, wouldn't it? After
all, when $i = "z" in the first expression, then wouldn't $i be equal
to "z"
in the second expression and thus halt the operation?
>
> What am I missing here?
It's a bit of a quirk. "z"++ is "aa" and "aa" < "z". I would guess
this would loop until until just before "za" which would be "yz".
What?
"z"++ < "z" returns true? =S
Is there a reason for this? Why aren't they handled like C chars?
Because PHP is not C. If you want them handled by their char codes,
then do so with chr() calls.
It's a bit like looping through the hexadecimal characters. You would
have the same effect. However instead of being base-16 with 0-9-a-f you
have base-26 using a-z.
0xF++ would be 0x10 which is greater than 0xF (0xF < 0x10). It's not the
same.
Sure it is. If you treat 0x10 as a string the same way he is treating
these as strings, then 0x10 is going to be smaller than 0xF.
The fact is that there is just no right answer for what "z"++ should do.
-Rasmus
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Re: [PHP] How do I make a HTML tree for a set of nodes?
On Sunday 04 June 2006 20:39, tedd wrote: > At 8:00 PM +0200 6/4/06, Niels wrote: >> >> >>> Using a combination of css and php will do what you want, I'm sure of >>> it. >>I want world peace... > > Well, if we were all programming php, we wouldn't have any war, but we > wouldn't have any peace either. :-) > > tedd There's always the good old Vi / Emacs war, if we get bored... //Niels -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
2006/6/4, Rasmus Lerdorf <[EMAIL PROTECTED]>:
Martin Alterisio wrote:
> 2006/6/4, Rasmus Lerdorf <[EMAIL PROTECTED]>:
>>
>> tedd wrote:
>> > Hi gang:
>> >
>> > Here's your opportunity to pound me again for not knowing the basics
of
>> php.
>> >
>> > I vaguely remember something like this being discussed a while back,
>> but
>> can't find the reference.
>> >
>> > In any event, if one uses --
>> >
>> > for ($i="a"; $i<"z"; $i++)
>> > {
>> > echo($i);
>> >}
>> >
>> > -- it stops at "y"
>> >
>> > But, if you use --
>> >
>> > for ($i="a"; $i<="z"; $i++)
>> > {
>> > echo($i);
>> >}
>> >
>> > -- it prints considerably more characters after "z" than what one
would
>> normally expect -- why is that?
>> >
>> > Just stopping at "z" would seem to make more sense, wouldn't it?
After
>> all, when $i = "z" in the first expression, then wouldn't $i be equal
>> to "z"
>> in the second expression and thus halt the operation?
>> >
>> > What am I missing here?
>>
>> It's a bit of a quirk. "z"++ is "aa" and "aa" < "z". I would guess
>> this would loop until until just before "za" which would be "yz".
>
>
> What?
> "z"++ < "z" returns true? =S
> Is there a reason for this? Why aren't they handled like C chars?
Because PHP is not C. If you want them handled by their char codes,
then do so with chr() calls.
That's cool, but you missed my point, I was just wondering why the ++
operator for string was handled that way. I used the C comparison becuase
it's more usual for coders to think as chars in terms of their position in
the ASCII table, allowing loops such as the mentioned above. I'm not trying
to start another witch hunt, there are enough rantings around for that
purpose.
It's a bit like looping through the hexadecimal characters. You would
>> have the same effect. However instead of being base-16 with 0-9-a-f
you
>> have base-26 using a-z.
>
>
> 0xF++ would be 0x10 which is greater than 0xF (0xF < 0x10). It's not
the
> same.
Sure it is. If you treat 0x10 as a string the same way he is treating
these as strings, then 0x10 is going to be smaller than 0xF.
The fact is that there is just no right answer for what "z"++ should do.
-Rasmus
Still:
anything < ++anything
should be true, or at least that's what they taught me on abstract data
types design, and I think they're right (at least this time)
Re: [PHP] When is "z" != "z" ?
At 11:08 AM -0700 6/4/06, Rasmus Lerdorf wrote:
>tedd wrote:
>>But, if you use --
>>
>>for ($i="a"; $i<="z"; $i++)
>> {
>> echo($i);
>> }
>>
>>-- it prints considerably more characters after "z" than what one would
>>normally expect -- why is that?
>>
>>Just stopping at "z" would seem to make more sense, wouldn't it? After all,
>>when $i = "z" in the first expression, then wouldn't $i be equal to "z" in
>>the second expression and thus halt the operation?
>>
>>What am I missing here?
>
>It's a bit of a quirk. "z"++ is "aa" and "aa" < "z". I would guess this
>would loop until until just before "za" which would be "yz".
>
>It's a bit like looping through the hexadecimal characters. You would have
>the same effect. However instead of being base-16 with 0-9-a-f you have
>base-26 using a-z.
>
>-Rasmus
-Rasmus:
Ahhh -- I see -- sort of.
However, if it has to be a base then it's more like base-676, going from a to
yz. Like DEC has 10 elements and HEX has 16 elements, this has 676 elements.
But, what brothers me about the routine, is that is DOES print "z" where it is
supposed to. In other words, the characters a-z are output before continuing
with aa and so on. The operation doesn't end with "z".
Shouldn't the expression $i ="z" be true when $i="z" and if $i is greater, then
be false?
For example, please review:
http://xn--ovg.com/a1.php
You can here that when $i = "z", then the condition is true and it prints
"Look". One would think that anything greater than that point would be false
and thus end the loop. But here we have an example of how we can have something
equal to something and then by adding 1 to it, it becomes smaller. That's not
logical.
Furthermore, if it was to work like a base, then I would expect "z" to the the
last character, not the 26th.
Here's another way to look at it. All characters before "z" are less than "z"
-- correct? So, what value are all characters after "z" (i.e., "aa-yz")? They
cannot be greater than, nor can they be less than. So, what are they?
tedd
PS: It was just a day, or so ago, that I said I didn't want disagree with you
and now what have you got me into?
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Re: [PHP] How do I make a HTML tree for a set of nodes?
At 8:59 PM +0200 6/4/06, Niels wrote: >On Sunday 04 June 2006 20:39, tedd wrote: > >> At 8:00 PM +0200 6/4/06, Niels wrote: >>> >>> Using a combination of css and php will do what you want, I'm sure of it. >>>I want world peace... >> >> Well, if we were all programming php, we wouldn't have any war, but we >> wouldn't have any peace either. :-) >> >> tedd > >There's always the good old Vi / Emacs war, if we get bored... Out of the xml camp, I liked this expression. tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
tedd wrote: But, what brothers me about the routine, is that is DOES print "z" where it is supposed to. In other words, the characters a-z are output before continuing with aa and so on. The operation doesn't end with "z". Your condition for the loop to continue is $i<="z". When $i = "y" it will obviously continue because "y" < "z" When $i = "z" it will obviously continue because "z" = "z" When $i = "aa" it will obviously continue because "aa" < "z" It doesn't stop until you get to "z"+something. As in "za" because at that point "za" > "z" so the last thing you see is the one before "za" which would be "yz". Here's another way to look at it. All characters before "z" are less than "z" -- correct? So, what value are all characters after "z" (i.e., "aa-yz")? They cannot be greater than, nor can they be less than. So, what are they? But you are not comparing things in the same context here. Strings are naturally compared alphabetically while you are thinking they are compared numerically somehow. Think of sorting a set of words. Would you expect "aa" to sort before or after "z" ? So yes, like I said, it is a bit of a quirk, but there is no good answer to what "z"++ should be and we certainly don't want to change the default comparison mechanism to not compare strings alphabetically because that would screw up all sorts of stuff including usorts and peoples' expectations. It's just in this case where you have gotten it into your head that incrementing strings is a good thing to do. You'd be much better off with a range call to quickly generate a range of characters. You could then loop through that character by character. Or use the chr() function to work with character codes instead. -Rasmus -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
Martin Alterisio wrote: Still: anything < ++anything should be true, or at least that's what they taught me on abstract data types design, and I think they're right (at least this time) In loosely typed languages that is not always true. Operators have to guess at the type and try to do what the user expects. There will always be edge cases. Being able to increment strings is pretty handy when you need to create sequences for unique file and directory names. For example, this also works: $filename = "file1"; $filename++; echo $filename; You would get "file2" from this. Think about the amount of code you would need to write in C to make that work? Then change $filename to "fileA" and increment it. And you get "fileB". When we get to "fileZ" we don't want to go off into unprintable character land, we want to try to stick with the pattern. -Rasmus -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
2006/6/4, Rasmus Lerdorf <[EMAIL PROTECTED]>: Martin Alterisio wrote: > Still: > anything < ++anything > should be true, or at least that's what they taught me on abstract data > types design, and I think they're right (at least this time) In loosely typed languages that is not always true. Operators have to guess at the type and try to do what the user expects. There will always be edge cases. Being able to increment strings is pretty handy when you need to create sequences for unique file and directory names. For example, this also works: $filename = "file1"; $filename++; echo $filename; You would get "file2" from this. Think about the amount of code you would need to write in C to make that work? Then change $filename to "fileA" and increment it. And you get "fileB". When we get to "fileZ" we don't want to go off into unprintable character land, we want to try to stick with the pattern. -Rasmus I still don't see why this functionality should be a native operator of the language. It doesn't seem natural that ++ operator "understands" that the string could be an enumeration of some kind. I believe that such things should be left to the coder who knows what the string is really representing, not to the language.
Re: [PHP] When is "z" != "z" ?
Martin Alterisio wrote: I still don't see why this functionality should be a native operator of the language. It doesn't seem natural that ++ operator "understands" that the string could be an enumeration of some kind. I believe that such things should be left to the coder who knows what the string is really representing, not to the language. That's the strictly typed argument. If you always force people to declare their types and you never automatically convert them, then you have a strictly typed language. You have the same thing happening for something like: echo "2"+"3"; In a strictly typed language that would spew an error. In a loosely typed language like PHP you get 5 And yes, I agree that ++ on strings is getting near the edge of that, but there has to be an edge somewhere and not everyone is going to agree on exactly where to draw the line. -Rasmus -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
At 12:27 PM -0700 6/4/06, Rasmus Lerdorf wrote: >tedd wrote: >>But, what brothers me about the routine, is that is DOES print "z" where it >>is supposed to. In other words, the characters a-z are output before >>continuing with aa and so on. The operation doesn't end with "z". > >Your condition for the loop to continue is $i<="z". > >[1] When $i = "y" it will obviously continue because "y" < "z" >[2] When $i = "z" it will obviously continue because "z" = "z" >[3] When $i = "aa" it will obviously continue because "aa" < "z" I agree with [1] and [2], but [3] is where we part company. You see, if you are right, then "aaa" would also be less than "z", but that doesn't appear so. >It doesn't stop until you get to "z"+something. As in "za" because at that >point "za" > "z" so the last thing you see is the one before "za" which would >be "yz". See above -- plus, I would expect that in evaluating a character, that character(s) would not enter the mix. If I was to evaluate a single digit, it would seem odd if double digits were allowed in that evaluation. >>Here's another way to look at it. All characters before "z" are less than "z" >>-- correct? So, what value are all characters after "z" (i.e., "aa-yz")? They >>cannot be greater than, nor can they be less than. So, what are they? > >But you are not comparing things in the same context here. Strings are >naturally compared alphabetically while you are thinking they are compared >numerically somehow. Think of sorting a set of words. Would you expect "aa" >to sort before or after "z" ? Not meaning to infer that you don't know this, because I know you do -- so I must be confused. Yes, it is my contention that strings are numerical -- you don't store "A" in memory, you store 0100 001, or ASCII DEC 65. Likewise "a" is DEC 97 (0110 0001) and "z" is DEC 122 (0111 1010) and if I compare "a" to "z" , it will always be less by numeric definition. However, if I compare "aa" with "z", then what? Is the numerical translation of the strings -- 0110 0001 0110 0001 < 0111 1010 equal to TRUE -- I don't think so. Likewise, is the string "aaa"" greater than "z" -- yep, I can buy that. But, if you hold that "aa" is less than "z", then everything must be less than "z" (except z stuff). So, the loop would continue until you hit the maximum allowable for strings -- that doesn't sound good. I can't see the logic that says "aa" is less than "z" while "aaa" is greater. That sounds like something our government would dream up. >So yes, like I said, it is a bit of a quirk, but there is no good answer to >what "z"++ should be and we certainly don't want to change the default >comparison mechanism to not compare strings alphabetically because that would >screw up all sorts of stuff including usorts and peoples' expectations. It's >just in this case where you have gotten it into your head that incrementing >strings is a good thing to do. Oh, I'm not saying to change anything. I've seen and worked with worse. >You'd be much better off with a range call to quickly generate a range of >characters. You could then loop through that character by character. Or use >the chr() function to work with character codes instead. I figured a way around it, I just thought it was odd. Thanks for your insight. tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
At 12:40 PM -0700 6/4/06, Rasmus Lerdorf wrote: >For example, this also works: > >$filename = "file1"; >$filename++; >echo $filename; > >You would get "file2" from this. Think about the amount of code you would >need to write in C to make that work? I would rather not. :-) tedd -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
tedd wrote: At 12:27 PM -0700 6/4/06, Rasmus Lerdorf wrote: tedd wrote: But, what brothers me about the routine, is that is DOES print "z" where it is supposed to. In other words, the characters a-z are output before continuing with aa and so on. The operation doesn't end with "z". Your condition for the loop to continue is $i<="z". [1] When $i = "y" it will obviously continue because "y" < "z" [2] When $i = "z" it will obviously continue because "z" = "z" [3] When $i = "aa" it will obviously continue because "aa" < "z" I agree with [1] and [2], but [3] is where we part company. You see, if you are right, then "aaa" would also be less than "z", but that doesn't appear so. Of course it is. php -r 'echo "aaa" < "z";' 1 Not meaning to infer that you don't know this, because I know you do -- so I must be confused. Yes, it is my contention that strings are numerical -- you don't store "A" in memory, you store 0100 001, or ASCII DEC 65. Likewise "a" is DEC 97 (0110 0001) and "z" is DEC 122 (0111 1010) and if I compare "a" to "z" , it will always be less by numeric definition. However, if I compare "aa" with "z", then what? Is the numerical translation of the strings -- 0110 0001 0110 0001 < 0111 1010 equal to TRUE -- I don't think so. No, but we are talking about collation here, not representation. Likewise, is the string "aaa"" greater than "z" -- yep, I can buy that. Well, it isn't. So the bulk of your rant is rather meaningless. -Rasmus -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
At 1:09 PM -0700 6/4/06, Rasmus Lerdorf wrote:
>>I agree with [1] and [2], but [3] is where we part company. You see, if you
>>are right, then "aaa" would also be less than "z", but that doesn't appear so.
>
>Of course it is.
>
>php -r 'echo "aaa" < "z";'
>1
You missed the point, why does --
for ($i="a"; $i<="z"; $i++)
{
echo($i);
}
-- not continue past "aaa"? Clearly, if "aaa" is less than "z" then why does
the loop stop at "yz"?
In any event, I'll stop my rant now, I thought we were having a discussion.
tedd
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Re: [PHP] When is "z" != "z" ?
On Sun, 2006-06-04 at 16:45, tedd wrote:
> At 1:09 PM -0700 6/4/06, Rasmus Lerdorf wrote:
> >>I agree with [1] and [2], but [3] is where we part company. You see, if you
> >>are right, then "aaa" would also be less than "z", but that doesn't appear
> >>so.
> >
> >Of course it is.
> >
> >php -r 'echo "aaa" < "z";'
> >1
>
> You missed the point, why does --
>
> for ($i="a"; $i<="z"; $i++)
> {
> echo($i);
>}
>
> -- not continue past "aaa"? Clearly, if "aaa" is less than "z" then why does
> the loop stop at "yz"?
Because right after 'yz' there is 'zz' and 'z' is neither less than nor
equal to 'zz'.
Cheers,
Rob.
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..
| InterJinn Application Framework - http://www.interjinn.com |
::
| An application and templating framework for PHP. Boasting |
| a powerful, scalable system for accessing system services |
| such as forms, properties, sessions, and caches. InterJinn |
| also provides an extremely flexible architecture for |
| creating re-usable components quickly and easily. |
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Re: [PHP] When is "z" != "z" ?
On Sun, 2006-06-04 at 16:53, Robert Cummings wrote: > > > > > -- not continue past "aaa"? Clearly, if "aaa" is less than "z" then why > > does the loop stop at "yz"? > > Because right after 'yz' there is 'zz' and 'z' is neither less than nor > equal to 'zz'. Err, that should say 'zz' is neither less than nor equal to 'z' :B Cheers, Rob. -- .. | InterJinn Application Framework - http://www.interjinn.com | :: | An application and templating framework for PHP. Boasting | | a powerful, scalable system for accessing system services | | such as forms, properties, sessions, and caches. InterJinn | | also provides an extremely flexible architecture for | | creating re-usable components quickly and easily. | `' -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
On Sun, 2006-06-04 at 15:10, Martin Alterisio wrote:
> Still:
> anything < ++anything
> should be true, or at least that's what they taught me on abstract data
> types design, and I think they're right (at least this time)
There's always limitations :)
int main( char *argv[], int argc )
{
int i = 0;
char c = 0x00;
char t = 0x00;
for( i = 0; i < 129; i++ )
{
t = c;
++c;
if( t < c )
{
printf( "Less than!\n" );
}
else
{
printf( "Not less than!\n" );
}
}
return 0;
}
Cheers,
Rob.
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::
| An application and templating framework for PHP. Boasting |
| a powerful, scalable system for accessing system services |
| such as forms, properties, sessions, and caches. InterJinn |
| also provides an extremely flexible architecture for |
| creating re-usable components quickly and easily. |
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[PHP] Garbage collection and strange session behaviour
Hi, Here is a simple script: ".session_id()." -that's our session id, hmmm"); ?> // END OF A SCRIPT The lines from #1 to #3 intentionally set these parameters to the garbage collector just to speed up the results of the problem. #4 - we're sleeping So, after first run we have: after #5 - a new session, #7 puts a variable in the session and #8 tells us about that. After #5 we also have the session file "/tmp/sess_?" written out there anywhere. On second run after #5 (we've been sleeping enough on #4 to have our session announced "old", "...dead-man-walking..." - quotation from 'The Green Mile' movie), the gc-monster is awaken and hungry for eating "old" session files. Finally we have the session file "/tmp/sess_?" deleted by the garbage collector after #5. That's guaranteed by #1 - #4. [If we put another 'sleep' after "/* #5 */session_start()", we may have time to switch to '/tmp' directory and persuade ourselves that there is no session file any more after the execution of #5.] No session file - no session variables anymore, no session at all??? WRONG ANSWER! We are sent to the 'else' clause, so "$_SESSION['a_sess_string]" is set and alive , and its value - additionally - is the one before the session file has gone (deleted) - "abcd" in my example. Obviously 'session_start()' first fills all of the sesion variables into memory, and after that shoots the garbage collector to go to finish its cleaning work. The session file is deleted, but inside the session, in our script, we are not acquainted with that... Until the end of script we are happy that everything is all right, but probably this self-confidence could lead us to some troubles later. Is there a workaround? Without going to the file system to check if the file still exists? A smart and elegant PHP session way, without any if-file-exists-checking functions? P.S. (To the administrators/moderators/whatever of this mailing list) - Please tell the people - write it somewhere on http://www.php.net/mailing-lists.php - that there is no chance to get subscribed if they are using any public mail address like @yahoo.com. It took me 2 days, I struggled like a pig with a pumpkin to find out... - Bulgarian National Radio IT Department (+359 2) 9336 615 BNR - Sofia, Bulgaria -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
On Sunday 04 June 2006 15:04, tedd wrote: > Yes, it is my contention that strings are numerical -- you don't store "A" > in memory, you store 0100 001, or ASCII DEC 65. In a low-level language like C, that matters. One doesn't have strings, one has numbers that happen to map to a symbol. In PHP and other high-level languages, strings are their own datatype. They may or may not even be stored as standard ascii number codes in order internally. You have to think of them as strings, not as numbers. There are no numbers involved here. There are only strings. > Likewise "a" is DEC 97 (0110 0001) and "z" is DEC 122 (0111 1010) and if I > compare "a" to "z" , it will always be less by numeric definition. In C or C++, yes. In PHP, do not assume the same string->number mapping. Numeric definition is irrelevant. -- Larry Garfield AIM: LOLG42 [EMAIL PROTECTED] ICQ: 6817012 "If nature has made any one thing less susceptible than all others of exclusive property, it is the action of the thinking power called an idea, which an individual may exclusively possess as long as he keeps it to himself; but the moment it is divulged, it forces itself into the possession of every one, and the receiver cannot dispossess himself of it." -- Thomas Jefferson -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
> There will always be edge cases. Being able to increment > strings is pretty handy when you need to create sequences for unique file > and directory names. > > For example, this also works: > > $filename = "file1"; > $filename++; > echo $filename; > > You would get "file2" from this. Think about the > amount of code you would need to write in C to make that work? > > Then change $filename to "fileA" and increment it. > And you get "fileB". > When we get to "fileZ" we don't want to go off > into unprintable > character land, we want to try to stick with the > pattern. Hmmm, didnt know about the $filename++; thingy, I used to do things the hard (C) way. Learnt something new...thanks! Cheers, Ryan -- - The faulty interface lies between the chair and the keyboard. - Creativity is great, but plagiarism is faster! - Smile, everyone loves a moron. :-) __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
At 4:53 PM -0400 6/4/06, Robert Cummings wrote: >On Sun, 2006-06-04 at 16:45, tedd wrote: > > > -- not continue past "aaa"? Clearly, if "aaa" is less than "z" then why > > does the loop stop at "yz"? > >Because right after 'yz' there is 'zz' and 'z' is neither less than nor >equal to 'zz'. and At 4:37 PM -0500 6/4/06, Larry Garfield wrote: >On Sunday 04 June 2006 15:04, tedd wrote: >> Likewise "a" is DEC 97 (0110 0001) and "z" is DEC 122 (0111 1010) and if I >> compare "a" to "z" , it will always be less by numeric definition. > >In C or C++, yes. In PHP, do not assume the same string->number mapping. Numeric definition is irrelevant. It's a sign of genius to make the complicated simple. Learning new things about php every day. Thank you both. tedd PS: Great language. -- thanks Lerdorf. -- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] php, eclipse, dbg, oh my
Eclipse - 3.1.2 Linux - 2.6.16-1.2111_FC4 PHP - 5.1.2, I built it. DBG - 2.13.1, I tried the binary, then built it on my own Apache - 2.0.55, I built it. PHP is running as a module but I've configured Eclipse to use the standard PHP5 executable instead. I wonder if anyone has gotten Eclipse debugging of PHP to work under Linux and if so what was used - dbg or some other tool? I've read pretty much of the available documentation, and tried most of the contained suggestions but nothing has worked yet. A lot of the suggestions are also geared towards windows users running Eclipse on that platform. Everything seems to be firing up but I get no presentation in the debugger screen except for the console which indicates my program ran and all the breakpoints were ignored. Any ideas? Thanks - Tod -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] When is "z" != "z" ?
tedd wrote:
At 1:09 PM -0700 6/4/06, Rasmus Lerdorf wrote:
I agree with [1] and [2], but [3] is where we part company. You see, if you are right, then
"aaa" would also be less than "z", but that doesn't appear so.
Of course it is.
php -r 'echo "aaa" < "z";'
1
You missed the point, why does --
for ($i="a"; $i<="z"; $i++)
{
echo($i);
}
-- not continue past "aaa"? Clearly, if "aaa" is less than "z" then why does the loop
stop at "yz"?
I thought I explained that a few times. The sequence is:
a b c ... x y z aa ab ac ... yx yy yz za zb zc ... zy zx zz aaa aab
Your loop stops at yz and doesn't get anywhere near aaa because za > z
-Rasmus
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Re: [PHP] When is "z" != "z" ?
Larry Garfield wrote: On Sunday 04 June 2006 15:04, tedd wrote: Yes, it is my contention that strings are numerical -- you don't store "A" in memory, you store 0100 001, or ASCII DEC 65. In a low-level language like C, that matters. One doesn't have strings, one has numbers that happen to map to a symbol. In PHP and other high-level languages, strings are their own datatype. They may or may not even be stored as standard ascii number codes in order internally. You have to think of them as strings, not as numbers. There are no numbers involved here. There are only strings. Likewise "a" is DEC 97 (0110 0001) and "z" is DEC 122 (0111 1010) and if I compare "a" to "z" , it will always be less by numeric definition. In C or C++, yes. In PHP, do not assume the same string->number mapping. Numeric definition is irrelevant. Right, and now bring Unicode into the picture and this becomes even more true. -Rasmus -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Garbage collection and strange session behaviour
Are you actually hitting this race condition in the real world? With a decently long maxlifetime setting I can't really see this being a realistic problem. Remember the timer is reset on every access. -Rasmus BNR - IT Department wrote: Hi, Here is a simple script: ".session_id()." -that's our session id, hmmm"); ?> // END OF A SCRIPT The lines from #1 to #3 intentionally set these parameters to the garbage collector just to speed up the results of the problem. #4 - we're sleeping So, after first run we have: after #5 - a new session, #7 puts a variable in the session and #8 tells us about that. After #5 we also have the session file "/tmp/sess_?" written out there anywhere. On second run after #5 (we've been sleeping enough on #4 to have our session announced "old", "...dead-man-walking..." - quotation from 'The Green Mile' movie), the gc-monster is awaken and hungry for eating "old" session files. Finally we have the session file "/tmp/sess_?" deleted by the garbage collector after #5. That's guaranteed by #1 - #4. [If we put another 'sleep' after "/* #5 */session_start()", we may have time to switch to '/tmp' directory and persuade ourselves that there is no session file any more after the execution of #5.] No session file - no session variables anymore, no session at all??? WRONG ANSWER! We are sent to the 'else' clause, so "$_SESSION['a_sess_string]" is set and alive , and its value - additionally - is the one before the session file has gone (deleted) - "abcd" in my example. Obviously 'session_start()' first fills all of the sesion variables into memory, and after that shoots the garbage collector to go to finish its cleaning work. The session file is deleted, but inside the session, in our script, we are not acquainted with that... Until the end of script we are happy that everything is all right, but probably this self-confidence could lead us to some troubles later. Is there a workaround? Without going to the file system to check if the file still exists? A smart and elegant PHP session way, without any if-file-exists-checking functions? P.S. (To the administrators/moderators/whatever of this mailing list) - Please tell the people - write it somewhere on http://www.php.net/mailing-lists.php - that there is no chance to get subscribed if they are using any public mail address like @yahoo.com. It took me 2 days, I struggled like a pig with a pumpkin to find out... - Bulgarian National Radio IT Department (+359 2) 9336 615 BNR - Sofia, Bulgaria -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Explicit Stream Flush with fsockopen()
Hi Guys, I know this may sound fundamental to some of you, but do you know any way of explicitly flushing out stream buffers off to the socket using fsockopen()/fputs() combos? Hope to hear from you soon. Note: I'm not using http, and I'm connecting to some other arbitrary port other than http, so I don't know if ob_flush() and its family of functions will work. Thanks! :) -- Oliver John V. Tibi Software Programmer/Web Application Developer IAMD Software Solutions [EMAIL PROTECTED] "Live free() or die()." -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Displaying data a certian way.
Ok, here's my issue that I have. Inside my database I have something that look's like this idserveridcabinetidect... - 1 server11 2 server21 3 server31 I am trying to get it to display the servers 1 2 & 3 under a display bar of cabinet 1. Anybody have any solutions to this? I am a novis to php and mysql but i know the majority of the basics.
Re: [PHP] Displaying data a certian way.
Just to clarify a little more, I want the output to do something like this... -- | Cabinet 1 | -- Server 1 Server 2 Server 3 and so forth... - Original Message - From: "Rob W." <[EMAIL PROTECTED]> To: Sent: Sunday, June 04, 2006 10:47 PM Subject: [PHP] Displaying data a certian way. Ok, here's my issue that I have. Inside my database I have something that look's like this idserveridcabinetidect... - 1 server11 2 server21 3 server31 I am trying to get it to display the servers 1 2 & 3 under a display bar of cabinet 1. Anybody have any solutions to this? I am a novis to php and mysql but i know the majority of the basics. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Displaying data a certian way.
Rob W. wrote:
Ok, here's my issue that I have.
Inside my database I have something that look's like this
idserveridcabinetidect...
-
1 server11
2 server21
3 server31
I am trying to get it to display the servers 1 2 & 3 under a display bar of
cabinet 1.
Anybody have any solutions to this? I am a novis to php and mysql but i know
the majority of the basics.
Remember the previous cabinet and you can use that for checking whether
to display another heading:
$previous_cabinet = '';
while($row = mysql_fetch_assoc($query_result)) {
if ($row['cabinetid'] != $previous_cabinet) {
echo "Cabinet id " . (int)$row['cabinetid'];
$previous_cabinet = $row['cabinetid'];
}
echo "Server " . htmlentities($row['serverid']) . "";
}
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Re: [PHP] Displaying data a certian way.
That worked. Thanks.
- Original Message -
From: "Chris" <[EMAIL PROTECTED]>
To: "Rob W." <[EMAIL PROTECTED]>
Cc:
Sent: Sunday, June 04, 2006 10:59 PM
Subject: Re: [PHP] Displaying data a certian way.
Rob W. wrote:
Ok, here's my issue that I have.
Inside my database I have something that look's like this
idserveridcabinetidect...
-
1 server11
2 server21
3 server31
I am trying to get it to display the servers 1 2 & 3 under a display bar
of cabinet 1.
Anybody have any solutions to this? I am a novis to php and mysql but i
know the majority of the basics.
Remember the previous cabinet and you can use that for checking whether to
display another heading:
$previous_cabinet = '';
while($row = mysql_fetch_assoc($query_result)) {
if ($row['cabinetid'] != $previous_cabinet) {
echo "Cabinet id " . (int)$row['cabinetid'];
$previous_cabinet = $row['cabinetid'];
}
echo "Server " . htmlentities($row['serverid']) . "";
}
--
Postgresql & php tutorials
http://www.designmagick.com/
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To unsubscribe, visit: http://www.php.net/unsub.php
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Re: [PHP] Delete
On 6/4/06, Larry Garfield <[EMAIL PROTECTED]> wrote: Only if delete.php is a confirmation page. Never ever ever have a delete function that operates solely by GET. Here's why: http://thedailywtf.com/forums/thread/66166.aspx Yes, I've seen that one before. IMO the main problem there is the faulty authentication system. If you put delete links public, and fail to put proper authentication in place, someone's going to delete your content, no matter if the delete action is a POST submit button or a GET link. I don't see how POST is better/more secure for a delete action. Rabin -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Delete
On Monday 05 June 2006 00:41, Rabin Vincent wrote: > On 6/4/06, Larry Garfield <[EMAIL PROTECTED]> wrote: > > Only if delete.php is a confirmation page. Never ever ever have a > > delete function that operates solely by GET. > > > > Here's why: http://thedailywtf.com/forums/thread/66166.aspx > > Yes, I've seen that one before. IMO the main problem there > is the faulty authentication system. If you put delete links > public, and fail to put proper authentication in place, someone's > going to delete your content, no matter if the delete action > is a POST submit button or a GET link. > > I don't see how POST is better/more secure for a delete action. > > Rabin Data-modification actions should always be made via POST, not GET, because they're harder to make by accident that way. They can't be bookmarked or easily picked up by spiders and search engines. GET should be used only for read-only actions. That's what it's for (GETting data). -- Larry Garfield AIM: LOLG42 [EMAIL PROTECTED] ICQ: 6817012 "If nature has made any one thing less susceptible than all others of exclusive property, it is the action of the thinking power called an idea, which an individual may exclusively possess as long as he keeps it to himself; but the moment it is divulged, it forces itself into the possession of every one, and the receiver cannot dispossess himself of it." -- Thomas Jefferson -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
