Online PHP editor | refs for S4XaH

<?php $arr = array( '100'=>array('age'=>22,'name'=>'jack','date'=>'2014'), '110'=>array('age'=>23,'name'=>'mary','date'=>'2012'), '120'=>array('age'=>24,'name'=>'lilei','date'=>'2015') ); uasort($arr, function($a1, $b) { if( $a['age'] === $b['age'] ){ return $a['date'] - $b['date']; } return $a['age'] - $b['age']; }); print_r($arr);