PHP实现对象属性按数组方式访问

主要思路实现ArrayAccess接口和__get,__set魔术方法

class ArrObject implements ArrayAccess {
    private $_data;
    public function __construct($data){
        $this->_data = $data;
    }
    public function offsetGet($offset){
        return ($this->offsetExists($offset) ? $this->_data[$offset] : null);
    }
    public function offsetSet($offset, $value){
        $this->_data[$offset] = $value;
    }
    public function offsetExists($offset){
        return isset($this->_data[$offset]);
    }
    public function offsetUnset($offset){
        if($this->offsetExists($offset)){
            unset($this->_data[$offset]);
        }
    }
    public function __get($offset){
        return ($this->offsetExists($offset) ? $this->_data[$offset] : null);
    }
    public function __set($offset, $value){
        $this->_data[$offset] = $value;
    }
}

测试：

$data  = array("a"=>"a","b"=>"b","c"=>"c");
$test  = new ArrObject($data);
echo $test["a"]; //a
echo $test->a;   //a