3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo 'success!'; header('Location: http://google.com');
Output for 7.1.25 - 7.1.28, 7.2.0 - 7.2.33, 7.3.0 - 7.3.26, 7.4.0 - 7.4.16, 8.0.0 - 8.0.3
success! Warning: Cannot modify header information - headers already sent by (output started at /in/Kc3Ci:3) in /in/Kc3Ci on line 4