3v4l.org

run code in 300+ PHP versions simultaneously
<?php $st = new stdClass(); $st->q = new stdClass(); $st->q->k = 1; $st->q->w = 2; $kl = $st->q; unset($kl->k); print_r($st); print_r($kl);
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.32, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
stdClass Object ( [q] => stdClass Object ( [w] => 2 ) ) stdClass Object ( [w] => 2 )
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
stdClass Object ( [q] => stdClass Object ( [k] => 1 [w] => 2 ) ) stdClass Object ( [w] => 2 )
preferences:
328.76 ms | 402 KiB | 448 Q