--TEST-- Test array_map() function : usage variations - array having subarrays --FILE-- 'a', 'b' => 2) ); var_dump( array_map('callback', $arr1)); echo "Done"; ?> --EXPECTF-- *** Testing array_map() : array having subarrays *** array(5) { [0]=> array(0) { } [1]=> array(2) { [0]=> int(1) [1]=> int(2) } [2]=> array(2) { [0]=> string(1) "a" [1]=> string(1) "b" } [3]=> array(4) { [0]=> int(1) [1]=> int(2) [2]=> string(1) "a" [3]=> string(1) "b" } [4]=> array(2) { [1]=> string(1) "a" ["b"]=> int(2) } } Done