3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var="ello worl"; echo <<<HTML H{$var}d HTML;
Output for 7.4.0 - 7.4.33, 8.0.1 - 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
Hello world
preferences:
113.58 ms | 406 KiB | 5 Q