専門家にアルゴリズムによる解決策を求める

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$a=array(
    array('id'=>'1','name'=>'a','url'=>'c'),
    array('id'=>'2','name'=>'aa','url'=>'cc'),
        array('id'=>'3','name'=>'aaa','url'=>'ccc')
);

$b=array(
    array('name'=>'aa','url'=>'cc'),
    array('name'=>'a','url'=>'c')
);

$t=配列();
foreach($b として $vl)
        $t[$vl['name'].$vl['url']]=$vl;

foreach($a as $k=>$v)
     if(!$t[$v['name'].$v['url']]) unset($a[$k]);
     
print_r($a);
<br><font color="#e78608">------解決策---------</font><br>