- var_dump: documentation ( source)
- in_array: documentation ( source)
- spl_object_hash: documentation ( source)
<?php
$a = new \stdClass;
$b = new \stdClass;
$c = $a;
$b->t = 1;
var_dump(spl_object_hash($a));
var_dump(spl_object_hash($b));
var_dump(spl_object_hash($c));
$aa = [$a, $b];
var_dump(in_array($c, $aa));