3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = function () { yield 1; echo 'hello'; yield 2; yield 3; echo 'world'; yield 4; }; foreach ($x() as $y) { echo $y; }
Output for 5.6.0 - 5.6.38, 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 - 8.1.29, 8.2.0 - 8.2.20, 8.3.0 - 8.3.8
1hello23world4

preferences:
213.88 ms | 404 KiB | 290 Q