----- Original Message -----
From: "Bob"
<snip>
Hi Rob,
Wow, I wasn't expecting you to go to so much trouble, and it's much
appreciated. There's certainly a lot for me to learn from this, from file
handling to the way you've organised it. I'm still looking at it in
amazement!
It works a treat and the layout and use of functions is great, making it
easier to understand. Also, the http-equiv="refresh" is a neat trick for
testing it.
I'm slowly realizing not to load a file or array with the data, and work
directly on the files. It's finally sunk in.
It's not normally the done thing to give someone the complete code, but it
would have taken a boat load of explaining on how to do it (well in my case,
grin!).
This line threw me for I while:
$trash = fgets($log_file);
as $trash isn't used anywhere.
But, then I realised this is how you were finding the record line ending,
which moves the file pointer to it. That's a really cool way of doing it!
I can see now why I couldn't get flock to work correctly, as I'd got it all
wrong.
I noticed you didn't use flock($handle, LOCK_UN), so is this not needed in
this case?
I'm still trying to understand the use of a reject.loc ?
$sleep = rand(1, 10000);
$time .= $sleep;
usleep($sleep);
I haven't work out why the random sleep yet?
I think you maybe doing something crafty that I'm missing?
Many thanks for this, Bob E.
------------------------------------
Hi Bob,
I didn't use flock($handle, LOCK_UN) as this automatically happens when the
script thread ends. However in some cases it may improve access for other
scripts.
I wrote the script so that other scripts can access the files as well if
they first check and lock the lock file.
I haven't used flock before, normally I just create a lock file and check
for its existence before accessing other files then unlinking it when
finished. The problem with this is that if a script terminated half way
through and doesn't unlink the lock file then there is a permanent lock. One
solution with smaller scripts that run very quickly is to watch the lock
file for a while longer then the scripts take to run and then access the
files as normal.
I read somewhere that flock has issues on some platforms and has to open the
file as write or append so I decided on a separate lock file. The log file
is opened in read mode.
Also fclose has to be done before renaming files and fclose also unlocks a
locked file.
The random sleep is from the php.net website. I expect that it is because
some scripts can end up synchronised so a random delay will break
synchronism.
Reading the script again I cab see two possible issues that you may want to
check -
1)
function file_lock($lock_filename)
{
if(!($handle = file_open($lock_filename, 'w')))
{
return FALSE;
}
Will opening an existing file in write mode fopen($filename, 'w') release
any previous locks on the file ??
2)
function file_passthrough($source_handle, $destination_handle)
{
while(!feof($source_handle))
{
$buffer = fread($source_handle, 4096);
fwrite($destination_handle, $buffer);
}
}
I should have explained that I am somewhat of a newbe to php!
In some other languages the above will write to a RAM buffer and the buffer
will only be written to the file system when the file stream is closed.
Does php have a way to flush a steam buffer to the file system ?
I will look.
Rob.
------------------------------------
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