- var_dump: documentation ( source)
<?php
$b = ['foo' => 1, 'bar' => -1];
$a = ['bar' => 1, 'foo' => -1];
var_dump($a < $b, $a <= $b, $a == $b, $a >= $b, $a > $b);
var_dump($a <=> $b);
var_dump($b < $a, $b <= $a, $b == $a, $b >= $a, $b > $a);
var_dump($b <=> $a);