- var_dump: documentation ( source)
<?php
$int = 50;
$arr['some' . ' complex' . ' index? with int ' . $int] = [[ 'type' => 'urls', 'urls' => ['url', 'murl', 'purl', 'turl']]];
$arrRef = &$arr['some' . ' complex' . ' index? with int ' . $int];
var_dump($arrRef);