3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 1; $b = &$a; $c = $b; $c = 2; $b = 20; echo $a," ",$b," ",$c;
Output for 7.1.25 - 7.1.32, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
20 20 2
preferences:
160.65 ms | 407 KiB | 5 Q