3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<body> <?php header('Content-Type: text/event-stream'); ?> </body>
Output for 5.2.3 - 5.6.28, 7.0.0 - 7.1.0
<body> Warning: Cannot modify header information - headers already sent by (output started at /in/4PAsM:2) in /in/4PAsM on line 3 </body>
Output for hhvm-3.10.0 - 3.12.0
<body> Warning: Cannot modify header information - headers already sent in /in/4PAsM on line 3 </body>
Output for 4.3.0 - 5.2.2
<body> </body>