3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $name = "tommy" ; ?> <?php headers_sent($filename, $linenum) ; header("name: $name") ; echo "tommy <br>" ; echo "Headers sent in $filename on line $linenum" ; ?>
Output for 7.0.20, 7.1.5 - 7.1.10
Warning: Cannot modify header information - headers already sent by (output started at /in/EoRQi:4) in /in/EoRQi on line 13 tommy <br>Headers sent in /in/EoRQi on line 4
Output for 5.2.3 - 7.0.14, 7.1.0
Warning: Cannot modify header information - headers already sent by (output started at /in/EoRQi:10) in /in/EoRQi on line 13 tommy <br>Headers sent in /in/EoRQi on line 10
Output for 4.3.0 - 5.2.2
tommy <br>Headers sent in /in/EoRQi on line 10