Online PHP editor | output for 6fHhP

<?php function array_flatten($array = null) { $result = array(); if (!is_array($array)) { $array = func_get_args(); } foreach ($array as $key => $value) { if (is_array($value)) { $result = array_merge($result, array_flatten($value)); } else { $result = array_merge($result, array($key => $value)); } } return $result; } $myarray = array('a', ['bla' => 0], 'b',[0,1], [0=>7], array(array(array('x'), 'y', 'z')), array(array('p'))); $res = array_flatten($myarray); var_dump( $res); $string_res = array_flatten( 'cramp' ); var_dump( $string_res );