- var_export: documentation ( source)
<?php
$x['a']['b']['c']['d']['e']='y';
$x['aaa']='FirstLevel';
$x['a']['_parent'] = &$x;
$x['a']['b']['_parent'] = &$x['a'];
$x['a']['b']['c']['_parent'] = &$x['a']['b'];
$x['a']['b']['c']['d']['_parent'] = &$x['a']['b']['c'];
var_export($x);