Online PHP editor | refs for PoPIE

<?php $arr = array( '56'=>array('class_name'=>'6','name'=>'jack','date'=>'2014'), '61'=>array('class_name'=>'2','name'=>'mary','date'=>'2012'), '57'=>array('class_name'=>'5','name'=>'lilei','date'=>'2015') ); uasort($arr, function($a, $b) { return $a['class_name'] - $b['class_name']; }); print_r($arr);