3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = new stdClass; $bar = new stdClass; $foo->bar = $bar; $bar->foo = $foo; echo json_encode($foo);
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Output for 5.4.0 - 5.4.45
Warning: json_encode(): recursion detected in /in/5rVEA on line 9 {"bar":{"foo":{"bar":null}}}
preferences:
102.44 ms | 2248 KiB | 4 Q