PHP二维数组搜索返回数组

 $ar = array(
     2 => array(
         'catid' => 2,
         'catdir' => 'notice',
     ),
     5 => array(
         'catid' => 5,
         'catdir' => 'subject',
     ),
     6=> array(
         'catid' => 6,
         'catdir' => 'news'
     ),
 );

 $catid = 5;
 $r = array_filter($ar, function($t) use ($catid) { return $t['catid'] == $catid; });
 print_r($r);

结果:

 Array
 (
     [5] => Array
         (
             [catid] => 5
             [catdir] => subject
         )

 )