3v4l.org

run code in 300+ PHP versions simultaneously
<?php function bar($a){} function foo(&$a){ var_dump($a); } foo($b); bar($a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
NULL Warning: Undefined variable $a in /in/iGt6F on line 7
Output for 5.0.4 - 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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
NULL Notice: Undefined variable: a in /in/iGt6F on line 7
Output for 7.3.32 - 7.3.33
NULL
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
NULL Notice: Undefined variable: a in /in/iGt6F on line 7
preferences:
283.19 ms | 402 KiB | 357 Q