Online PHP editor | refs for PF2Ug

<?php $a = new stdClass; $a->foo = 'hello'; var_dump(spl_object_hash($a)); $b = new stdClass; $b->foo = 'world'; var_dump(spl_object_hash($b)); $c = new stdClass; $c->foo = 'hello'; var_dump(spl_object_hash($c)); unset($c); // <= important $d = new stdClass; $d->foo = 'world'; var_dump(spl_object_hash($d));