怎麼取數組的交集，求大神指導

這是兩個二維數組$arr,$arr1,怎麼取出相同的交集$arr = array(array("id" => "3","name" => "張三"),array("id" => "6","name" => "李四"),array("id" => "8","name" =>  "王五"),array("id" => "18","name" => "趙六"), array("id" => "20","name" => "七七") );$arr1 = array(array("id" => "6","name" => "張三",),                array("id" => "18","name" => "趙六"),);想要的結果是array(array("id" => "6","name" => "張三",),                array("id" => "18","name" => "趙六"));

回複討論(解決方案)

$arr = array(        array("id" => "3","name" => "張三"),        array("id" => "6","name" => "李四"),        array("id" => "8","name" =>  "王五"),        array("id" => "18","name" => "趙六"),        array("id" => "20","name" => "七七")     );$arr1 = array(        array("id" => "6","name" => "張三",),        array("id" => "18","name" => "趙六"),);foreach($arr as $a)  foreach($arr1 as $k=>$b)    if($a == $b) {      $r[] = $b;      unset($arr1[$k]);    }print_r($r);

Array(    [0] => Array        (            [id] => 18            [name] => 趙六        ))

可是我想要的結果是這個：

$arr1 = array(        array("id" => "6","name" => "張三",),        array("id" => "18","name" => "趙六"),);

是我看錯了，sorry

