! means not, for example $yes != $no
Regarding the (xxx) ? x : x;
Your assumption is correct
I use it alot, but sometimes it's still better to use if/else statements
On Thu, 2003-09-25 at 11:47, Jeff McKeon wrote:
> I've just picked up a more advanced book on PHP and it has a lot of
> example code in it. I understand most of it but some things I'm seeing I
> don't understand. Like the following...
>
> code:
> ------------------------------------------------------------------------
> --------
>
> $couponcode = (! empty($_REQUEST['couponcode'])) ?
> $_REQUEST['couponcode'] : NULL;
> ------------------------------------------------------------------------
> --------
>
> I think this is saying:
>
> If the global variable couponcode is not empty, then the variable
> '$couponcode' is equal to "$_REQUEST['couponcode']" otherwise it gets a
> "NULL" value.
>
> What's throwing me is the use of the "!" and "?" and ":"
>
> If What I suspect is correct, I've never seen an if-then statement like
> this. If it is a replacement for an IF-Then statement then it's much
> cleaner and I'd like to use it.
>
> another one is:
>
>
> code:
> ------------------------------------------------------------------------
> --------
> IF (!strcmp($operator, '+')) {
> $result = $num1 + $num2
> }
> ------------------------------------------------------------------------
> --------
>
> I've looked up strcmp() and know it's used to compair two strings. The
> $operator variable in the script that this was taken from is set to
> either "-", "+", "*" or "/". What I don't understand here is what the
> "!" in front of strcmp() means.
>
> Can anyone break down the code for me and explain the parts?
>
> thanks,
>
> Jeff
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