function multi2one($arr, &$tmp = []) { foreach ($arr as $value) { if (is_array($value)) { multi2one($value, $tmp); } else { $tmp[] = $value; } } return $tmp; }
function multi2one($arr, &$tmp = []) { foreach ($arr as $value) { if (is_array($value)) { multi2one($value, $tmp); } else { $tmp[] = $value; } } return $tmp; }