3v4l.org

run code in 150+ php & hhvm versions
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<?php $st = new stdClass(); $st->q = new stdClass(); $st->q->k = 1; $st->q->w = 2; print_r($st);
based on KBckr
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
stdClass Object ( [q] => stdClass Object ( [k] => 1 [w] => 2 ) )