3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php class Pony { public $tail; } $fluttershy = new Pony(); $fluttershy->tail = new Pony(); $fluttershy->tail->tail = new Pony(); echo json_encode($fluttershy);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
{"tail":{"tail":{"tail":null}}}