Description:
------------
RETURN NULL?!?! see documentation

http://br.php.net/manual/pt_BR/function.in-array.php

just can return TRUE or FALSE! NULL isn't allowed!
see that i'm using 4 parameters and no error was showed

Reproduce code:
---------------
<?php

	$images=array(
		"cabec0" => "cabec0",		"cabec1" => "cabec1",
		"cabec2" => "cabec2",		"cabec3" => "cabec3",
		"cabec4" => "cabec4",
		"login0" => "login0",		"login1" => "login1",
		"login2" => "login2",		"login3" => "login3",
		"login4" => "login4",

		"messenger0" => "messenger0",	"messenger1" => "messenger1",
		"messenger2" => "messenger2",	"messenger3" => "messenger3",
		"messenger4" => "messenger4",

		"file_explorer0" => "explorer0","file_explorer1" => "explorer1",
		"file_explorer2" => "explorer2","file_explorer3" => "explorer3",
		"file_explorer4" => "explorer4",
		
		"yellow"=>"yellow","red"=>"red",
		"gray"=>"gray","blue"=>"blue","green"=>"green",

		"logo"   => "logo.png",		"smm"   => "smm.gif"
	);

$image='rodape';
var_dump(in_array($image,'logo','rodape','smm'));
print_r($images);
?>

Expected result:
----------------
FALSE

Actual result:
--------------
NULL