- var_dump: documentation ( source)
- array_diff: documentation ( source)
<?php
$a = ['id' => 12, 'bar' => 'foo', 'baz' => 'qux', 'buz' => ['quxxx' => 'biz']];
$b = ['id' => 12, 'bar' => 'foo', 'baz' => 'quxx', 'buz' => ['quxxx' => 'biz']];
var_dump(array_diff($a,$b));