- print_r: documentation ( source)
<?php
$array = array(
'123' => array('data' => array(array('id'=>2,'description'=>'Single-player'), array('id'=>1,'description'=>'Multiple-player'))),
'456' => array('data' => array(array('id'=>2,'description'=>'Single-player'), array('id'=>1,'description'=>'Multiple-player'))),
);
print_r($array);