测试递归数组上的引用相等性

Question

<?php
$a = [];
$b = [&$a];
$a[] = &$b;

Assuming we have a recursive array - is there any PHP builtin that will test for equality including references?

Standard comparison operators throw a fatal error, and while array_diff doesn't crash it does spit out a ton of notices.

I could always compare print_r($a, true) == print_r($b, true) but this would incorrectly identify $a and $b as the same (Their values may be the same but the references they contain aren't)