3v4l.org

run code in 300+ PHP versions simultaneously
<?php $mainArray = array( 0 =>array( "key1" => array(7,4,5), 'key2' => array('cc','aa') ) ); foreach($mainArray as &$secondArray){ foreach ($secondArray as &$array) { array_multisort($array); } } var_dump($mainArray);

preferences:
36.64 ms | 402 KiB | 5 Q