   #PHP Manual Types Resource Pseudo-types used in this documentation

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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

     * it has been assigned the constant NULL.
     * it has not been set to any value yet.
     * it has been unset().

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().
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