array_search Searches the array for a given value and returns the corresponding key if successful mixedarray_search mixedneedle arrayhaystack boolstrict Searches haystack for needle and returns the key if it is found in the array, &false; otherwise. Prior to PHP 4.2.0, array_search returns NULL on failure instead of &false;. If the optional third parameter strict is set to &true; then the array_search will also check the types of the needle in the haystack. &return.falseproblem; See also array_keys, array_values, array_key_exists, and in_array.