3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo($arr) { $arr = [$arr]; $arr['x'] = 5; print_r(func_get_args()); } foo([]);
Output for 8.1.23 - 8.1.33, 8.2.10 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Array ( [0] => Array ( [0] => Array ( ) [x] => 5 ) )
preferences:
40.71 ms | 406 KiB | 5 Q