Operating With Extreme Caution - PHP

Of course, the example you've just seen is very rudimentary. To really add some punch to it, you need to know how to construct what the geeks call a conditional statement. And the very basis of a conditional statement is comparison - for example, "if this is equal to that, do thus and such".

PHP comes with a bunch of useful operators designed specifically for use in conditional statement. Here's a list:

Assume $delta = 12 and $omega = 9

Operator	What It Means	Expression	Evaluates To
==	is equal to	$delta == $omega	False
!=	is not equal to	$delta != $omega	True
>	is greater than	$delta > $omega	True
<	is less than	$delta < $omega	False
>=	is greater than or equal to	$delta > = $omega	True
<=	is less than or equal to	$delta <= $omega	False

PHP4 also introduces a new operator, which tests both for equality and type: the === operator. There's a simple illustration of this on the last page.

>>> More PHP Articles          >>> More By Vikram Vaswani and Harish Kamath, (c) Melonfire

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