On Tue, 6 Feb 2007, Tris wrote:
> However, I've seen sites (PHPMyAdmin springs to mind?) where the
> language include uses DEFINE..
>
> What is the difference, and why is one better than the other..?
define() is used when you want to define a constant. A constant is
something that isn't going to change during the execution of the script.
For example,
define('LANG', 'english');
if (LANG == 'english') {
print "Something in English";
}
The equivalent with a variable:
$lang = 'english';
if ($lang == 'english') {
print "Something in English";
}
The constant has the advantage of knowing it won't change, you can't
accidentally do if (LANG = 'english') (the time-honoured assignment
instead of test for equality - the cause of many a keyboard->programmer's
forehead interface). Also, I'd guess that PHP might be able to do some
optimisations for constants, since it knows they're not going to be
changing, but that's purely speculation on my part.
Cheers
Dave P
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