Re: [PHP] Help understanding code...

[Brent Baisley]

Your assumptions are correct. It's called a ternary operator and it is  
a substitution or the if-else statements. I try not to overuse it since  
I don't think it's as readable as the block if statement. But for  
things not assigning a value to a variable, I think it's better than  
the block statement since you're more interested in the variable  
declaration than the condition of it's value.

On Thursday, September 25, 2003, at 12:47 PM, 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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Brent Baisley
Systems Architect
Landover Associates, Inc.
Search & Advisory Services for Advanced Technology Environments
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