3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 100; $b = 200; echo "$a, $b\n"; [ $b, $a ] = [ $a, $b ]; echo "$a, $b\n";
Output for 7.4.0 - 7.4.30, 8.0.1 - 8.0.20, 8.1.0 - 8.1.7
100, 200 200, 100

preferences:
40.38 ms | 409 KiB | 5 Q