How to use object of type ClassName as array [ 2.0 版本 ]

The tricker is ArrayAccess.

class Model extends Component implements IteratorAggregate, ArrayAccess, Arrayable
{

You can try the following:

<?php
class model implements ArrayAccess
{
	public $que ;
	 //This method is required by the SPL interface [[\ArrayAccess]].
	public function offsetExists($offset)
	{
		return $this->$offset !== null;
	}
	 //This method is required by the SPL interface [[\ArrayAccess]].
	public function offsetGet($offset)
	{
		return $this->$offset;
	}
	 //This method is required by the SPL interface [[\ArrayAccess]].
	public function offsetSet($offset, $item)
	{
		$this->$offset = $item;
	}
	 //This method is required by the SPL interface [[\ArrayAccess]].
	public function offsetUnset($offset)
	{
		$this->$offset = null;
	}
}

$model = new model();
$model['que'] = 'xxx';               // <================   it works now%