- var_dump: documentation ( source)
<?php
$a = ['foo' => 2, 'bar' => 5];
$b = ['bar' => 4, 'foo' => 3];
foreach($a as $k => $_) var_dump($k);
foreach($b as $k => $_) var_dump($k);
var_dump($a > $b);
var_dump($b > $a);
var_dump($a < $b);
var_dump($b < $a);