Description:
------------
The Polish doc page ( http://www.php.net/manual/pl/function.array-search.php ) says that returned value (if search didn't find anything) is NULL _starting_ from PHP 4.1.2, while the English one says that function returns NULL _prior_ to PHP 4.2.0.

[EN:] Note:  Prior to PHP 4.2.0, array_search() returns NULL on failure instead of FALSE.

[PL:] Notatka:  Począwszy od PHP 4.1.2, array_search() zwraca NULL w przypadku niepowodzenia zamiast FALSE

It looks to me like the first (English) one is correct. Below is a simple test script.

Also, in Polish doc there is different version number but I cannot confirm which is proper (I guess the one in English doc).

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

echo 'Current PHP version: ' . phpversion() . "\n";

$arr = array('the', 'show', 'must', 'go', 'on');
$result = array_search('bleah', $arr);
if ($result === FALSE) {
	echo 'search result: FALSE';
} else if ($result === NULL) {
	echo 'search result: NULL';
} else {
	echo 'search result: "bleah" was found';
}

?>

Expected result:
----------------
/** according to Polish doc **/

Current PHP version: 5.0.4
search result: NULL


Actual result:
--------------
Current PHP version: 5.0.4
search result: FALSE