Resource Pseudo-types and variables used in this documentation Types PHP Manual NULL The special value represents that a variable has no value. is the only possible of type . Note : null type was in...

NULL

The special NULL value represents that a variable has no value. NULL is the only possible value of type NULL.

Note: The null type was introduced in PHP 4.

A variable is considered to be NULL if

There is only one value of type NULL, and that is the case-insensitive keyword NULL.


<?php
$var = NULL;       
?>