key Fetch a key from an array &reftitle.description; intstringnullkey arrayobjectarray key returns the index element of the current array position. &reftitle.parameters; array The array. &reftitle.returnvalues; The key function simply returns the key of the array element that's currently being pointed to by the internal pointer. It does not move the pointer in any way. If the internal pointer points beyond the end of the elements list or the array is empty, key returns &null;. &reftitle.changelog; &Version; &Description; &standard.changelog.calling-on-objects; &reftitle.examples; 'apple', 'fruit2' => 'orange', 'fruit3' => 'grape', 'fruit4' => 'apple', 'fruit5' => 'apple'); // this cycle echoes all associative array // key where value equals "apple" while ($fruit_name = current($array)) { if ($fruit_name == 'apple') { echo key($array), "\n"; } next($array); } ?> ]]> &example.outputs; &reftitle.seealso; current next array_key_first foreach