PHP二维数组根据某个元素去重

 function array_unset($arr,$key){     
        //建立一个目标数组  
        $res = array();        
        foreach ($arr as $value) {           
           //查看有没有重复项  
             
           if(isset($res[$value[$key]])){  
                 //有：销毁  
                  
                 unset($value[$key]);  
                   
           }  
           else{  
                  
                $res[$value[$key]] = $value;  
           }    
        }  
        return $res;  
    }  
$arr = array(  
              
            array(  
            'title'=>'1111','date'=>'ddddd'  
                  
            ),  
            array('title'=>'22222','date'=>'fffffff'),  
            array('title'=>'1111','date'=>'ggggggg')  
);  
$newArr = array_unset_tt($arr,'title');  
echo &#39;<pre class="brush:php;toolbar:false">&#39;;  
  
print_r(array_values($newArr));