$ar = array(
2 => array(
'catid' => 2,
'catdir' => 'notice',
),
5 => array(
'catid' => 5,
'catdir' => 'subject',
),
6=> array(
'catid' => 6,
'catdir' => 'news'
),
);$catid = 5;
$r = array_filter($ar, function($t) use ($catid) { return $t['catid'] == $catid; });
print_r($r);
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