Online PHP editor | refs for lgPgO

<?php $arr = array ( array ('Q1',2017), array ('Q3',2017), array ('Q3',2012), array ('Q4',2015), array ('Q4',2017), array ('Q2',2017), ); $new = array(); foreach($arr as $subarr){ $new[$subarr[1]][] = $subarr[0]; sort($new[$subarr[1]]); } ksort($new); $finalarr = array(); foreach($new as $key => $val){ foreach($val as $k=>$v){ $finalarr[] = array($v, $key); } } echo "<pre>"; print_r($finalarr);