- var_dump: documentation ( source)
- spl_object_hash: documentation ( source)
<?php $a = new stdClass();$b = new stdClass();var_dump(spl_object_hash($a));var_dump(spl_object_hash($b));$b = $a;var_dump(spl_object_hash($a));var_dump(spl_object_hash($b));unset($a);var_dump(spl_object_hash($b));