(PHP 4 >= 4.0.4, PHP 5, PHP 7)
Finds whether a variable is
NULL
bool is_null ( mixed $var )
Finds whether the given variable is NULL
.
Parameters:
var
The variable being evaluated.
Returns:
Returns TRUE
if var
is null, FALSE
otherwise.
Examples:
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)
See also:
NULL -
isset() -
is_int() -
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