3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo "Hello, World!"; header('Content-Type: text/csv');
Output for 5.2.3 - 5.6.28, 7.0.0 - 7.1.0
Hello, World! Warning: Cannot modify header information - headers already sent by (output started at /in/gD3nn:2) in /in/gD3nn on line 3
Output for hhvm-3.10.0 - 3.13.2
Hello, World! Warning: Cannot modify header information - headers already sent in /in/gD3nn on line 3
Output for 4.3.0 - 5.2.2
Hello, World!