Identical Operator

Identical is the state of two variables, which contains the same data, with the same type. It is the same as equality, without the type-juggling.

Identical operators are ===, !==. The match() command also uses identical comparisons.

<?php

var_dump(0 == "0000"); // true
var_dump(0 === "0");   // false
var_dump(0 === 0);     // true

?>

Documentation

See also How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators differ?

Related : Comparison