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(PHP 4 >= 4.0.4, PHP 5)
is_null —
Finds whether a variable is NULL
var
The variable being evaluated.
Returns TRUE
if var
is null, FALSE
otherwise.
Example #1 is_null() example
<?php
error_reporting(E_ALL);
$foo = NULL;
var_dump(is_null($inexistent), is_null($foo));
?>
Notice: Undefined variable: inexistent in ... bool(true) bool(true)
NULL
type