3v4l.org

run code in 500+ PHP versions simultaneously
<?php function sub(&$data){} $data = array(); sub($data['nested']); echo serialize(array($data,$data));
Output for 5.6.0 - 5.6.24, 7.0.8 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 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 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
a:2:{i:0;a:1:{s:6:"nested";N;}i:1;a:1:{s:6:"nested";N;}}
Output for 7.0.0 - 7.0.7
a:2:{i:0;a:1:{s:6:"nested";N;}i:1;a:1:{s:6:"nested";R:3;}}
preferences:
36.53 ms | 1143 KiB | 11 Q