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
        )
 
)