3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
aaa<?php header('Content-Type: text/csv');
Output for 5.2.3 - 7.2.0
aaa Warning: Cannot modify header information - headers already sent by (output started at /in/nooOK:1) in /in/nooOK on line 2
Output for 4.3.0 - 5.2.2
aaa