array_search Searches the array for a given value and returns the corresponding key if successful &reftitle.description; mixedarray_search mixedneedle arrayhaystack boolstrict Searches haystack for needle. &reftitle.parameters; needle The searched value. If needle is a string, the comparison is done in a case-sensitive manner. haystack The array. strict If the third parameter strict is set to &true; then the array_search function will also check the types of the needle in the haystack. &reftitle.returnvalues; Returns the key for needle if it is found in the array, &false; otherwise. If needle is found in haystack more than once, the first matching key is returned. To return the keys for all matching values, use array_keys with the optional search_value parameter instead. &return.falseproblem; &reftitle.changelog; &Version; &Description; 4.2.0 Prior to PHP 4.2.0, array_search returns &null; on failure instead of &false;. &reftitle.examples; 'blue', 1 => 'red', 2 => 'green', 3 => 'red'); $key = array_search('green', $array); // $key = 2; $key = array_search('red', $array); // $key = 1; ?> ]]> &reftitle.seealso; array_keys array_values array_key_exists in_array