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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().
There is only one value of type NULL, and that is
the case-insensitive keyword NULL.
<?php
$var = NULL;
?>