二维数组去除特定键的重复项

<?php
// 本类由系统自动生成，仅供测试用途
class IndexAction extends Action {
    //原始数据
   /*Array 
(
    [0] => Array
        (
            [ap] => 23
            [ac] => 569418
        )

    [1] => Array
        (
            [ap] => 23
            [ac] => 569520
        )

    [2] => Array
        (
            [ap] => 23
            [ac] => 569533
        )

)*/

//除去重复值后的数据
/*Array
(
    [23] => Array
        (
            [ap] => 23
            [ac] => 569418
        )

)*/
    public function index(){
        $arr=array();
        $arr=array(‘0‘=>array(‘ap‘=>‘23‘,‘ac‘=>‘569418‘),
        ‘1‘=>array(‘ap‘=>‘23‘,‘ac‘=>‘569520‘),‘2‘=>array(‘ap‘=>‘23‘,‘ac‘=>‘569533‘));
        print_r($arr);
        $key=‘ap‘;
        $arr=$this->array_unset($arr,$key);
        print_r($arr);
        //$this->display();
    }

    //二维数组去除特定键的重复项
    public function array_unset($arr,$key){//$arr->传入数组 $key->判断的key值
        //建立一个目标数组
        $res = array();      
        foreach (array_reverse($arr) as $value){//array_reverse() php 数组顺序反转                   
           if(isset($res[$value[$key]])){//查看有没有重复项             
                 unset($value[$key]);//有：销毁
           }else{
                $res[$value[$key]] = $value;
           }
        }
        return $res;
    }
}

?>