array_search Searches the array for a given value and returns the corresponding key if successful &reftitle.description; mixedarray_search mixedneedle arrayhaystack boolstrictfalse 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 search for identical elements in the haystack. This means it will also check the types of the needle in the haystack, and objects must be the same instance. &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; 5.3.0 As with all internal PHP functions as of 5.3.0, array_search returns &null; if invalid parameters are passed to it. 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