3v4l.org

run code in 300+ PHP versions simultaneously
<?php declare(strict_types=1); $a = 'a'; $b = 'b'; [$b, $a] = [$a, $b]; echo "$a $b";
Output for 8.0.1 - 8.0.27, 8.1.0 - 8.1.14, 8.2.0 - 8.2.1
b a

preferences:
19.39 ms | 406 KiB | 5 Q