像数组一样使用对象 php

//ArrayAccess php内置
class ObjArray implements \ArrayAccess {
    private $testArray =[
        "test" =>"gzh",
    ];

    public function offsetExists($key){
        echo "offsetExists".$key.PHP_EOL;
        return isset($this->testArray[$key]);
    }
    public function offsetGet($key){
        echo "offsetGet".$key.PHP_EOL;
        return $this->testArray[$key];
    }
    public function offsetSet($key,$value){
        echo "offsetSet".$key.PHP_EOL;
        $this->testArray[$key] = $value;
    }
    public function offsetUnset($key){
        echo "offsetUnset".$key.PHP_EOL;
        unset($this->testArray[$key]);
    }

}

 

$obj = new \ObjArray();

$obj['age'] =12;
unset($obj['test']);
isset($obj['test']);
var_dump($obj['age']);