3v4l.org

run code in 300+ PHP versions simultaneously
<?php const C = [1, 2, 3]; function foo(): array { return C; } foo()[] = 4; var_dump(C);
Output for 8.3.5 - 8.3.30, 8.4.9 - 8.4.17, 8.5.1 - 8.5.2
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }
preferences:
50.76 ms | 406 KiB | 5 Q