PHP Manuál
PredchádzajúciKapitola 11. TypesNasledujúci

NULL

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

Poznámka: The null type was introduced in PHP 4.

A variable is considered to be NULL if

Syntax

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

<?php
$var = NULL;       
?>

See also is_null() and unset().

PredchádzajúciDomovNasledujúci
ResourceHorePseudo-types used in this documentation