3v4l.org

run code in 300+ PHP versions simultaneously
<body> <?php header('Content-Type: text/event-stream'); ?> </body>
Output for 7.0.18 - 7.0.33, 7.1.4 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<body> Warning: Cannot modify header information - headers already sent by (output started at /in/4PAsM:1) in /in/4PAsM on line 3 </body>
Output for 5.2.3 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.17, 7.1.0 - 7.1.3
<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 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
<body> </body>
preferences:
281.66 ms | 402 KiB | 460 Q