Online PHP editor | refs for QJIqL

<?php $arr=array(array("img","dummies","slides","01.jpg"),array("img","dummies","slides","01.jpg"),array("img","dummies","slides","01.jpg")); print_r($arr); echo $num_arr=count($arr); for($i=0;$i<$num_arr;$i++) { $new_key="key_".$i; $arr[$new_key] = $arr[$i]; unset($arr[$i]); } print_r($arr);