3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = new stdClass; $storage = new SplObjectStorage; $storage[$foo] = $foo; var_dump(isset($storage[$foo])); var_dump($storage[$foo]); unset($storage[$foo]); var_dump(isset($storage[$foo]));

preferences:
44.08 ms | 402 KiB | 5 Q