3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
aaa<?php header('Content-Type: text/csv');
Output for 5.2.3 - 5.6.28, 7.0.0 - 7.1.0
aaa Warning: Cannot modify header information - headers already sent by (output started at /in/nooOK:1) in /in/nooOK on line 2
Output for hhvm-3.12.0
aaa Warning: Cannot modify header information - headers already sent in /in/nooOK on line 2
Output for hhvm-3.10.0
aaa Warning: Cannot modify header information - headers already sent in /in/nooOK on line 8
Output for 4.3.0 - 5.2.2
aaa