PHP: NULL - Manual

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Resources	Pseudo-types and variables used in this documentation

	Last updated: Thu, 26 Jun 2008

NULL

The special NULL value represents a variable with 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;       

?>

See also the functions is_null() and unset().

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Resources	Pseudo-types and variables used in this documentation

	Last updated: Thu, 26 Jun 2008

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