note 21845 modified in function.array-search by vrana

For versions later than 4.2.0, the check isset($key) won't work properly because the function now returns false, which "isset". This change is missing in the Change Log! So the right way to use the function is: <?php $key = array_search($needle, $array); if ($key!==null&&$key!==false) { ... } ?> This example will work in both older and newer to 4.2.0 versions. P.S.: My previous post where isset() is used won't work in newer versions. --was-- For versions later than 4.2.0, the check isset($key) won't work properly because the function now returns false, which "isset". This change is missing in the Change Log! So the right way to use the function is: $key = array_search($needle, $array); if ($key!==null&&$key!==false) { ... } This example will work in both older and newer to 4.2.0 versions. P.S.: My previous post where isset() is used won't work in newer versions. http://php.net/manual/en/function.array-search.php