Скачать или смотреть PHP Comparison Operators

Comparison operators, as their name implies, allow you to compare two values. You may also be interested in viewing the type comparison tables

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comparison operators take simple values (numbers or strings) as arguments and evaluate to either TRUE or FALSE. TRUE if $x is exactly equal to $y, and they are of the same type. TRUE if $x is exactly not equal to $y. TRUE if $x is exactly not equal to $y.
PHP divides the operators in the following groups:

Arithmetic operators
Assignment operators
Comparison operators
Increment/Decrement operators
Logical operators
String operators
Array operators