3v4l.org

run code in 300+ PHP versions simultaneously
<?php function closure() { $a = 0; return function () use (&$a) { return $a++; }; } $c = closure(); var_dump($c()); var_dump($c()); var_dump($c()); var_dump($c()); var_dump($c());
Output for 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
int(0) int(1) int(2) int(3) int(4)
preferences:
190.79 ms | 404 KiB | 292 Q