3v4l.org

run code in 300+ PHP versions simultaneously
<?php ob_start(); echo false;echo true; var_dump(ob_get_clean());
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(1) "1"

preferences:
159.81 ms | 403 KiB | 185 Q