Online PHP editor | refs for Ysm4a

<?php error_reporting(E_ALL);class RefArray implements ArrayAccess { public $array; public function &offsetGet($key) { return $this->array[$key]; } public function offsetSet($key, $value) { $this->array[$key] = $value; } public function offsetExists($key) { return isset($this->array[$key]); } public function offsetUnset($key) { unset($this->array[$key]); }}$obj = new stdClass;$obj->prop1 = 'abc';$obj->prop2 =& $obj->prop1;$obj->prop2 .= 'xyz';var_dump($obj->prop1);$obj->prop3 = 1;$obj->prop4 =& $obj->prop3;++$obj->prop4;var_dump($obj->prop3);$arr = new RefArray;$arr[0] = 'abc';$arr[1] =& $arr[0];$arr[1] .= 'xyz';var_dump($arr[0]);