3v4l.org

run code in 300+ PHP versions simultaneously
poop <?php session_start();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
poop Warning: session_start(): Session cannot be started after headers have already been sent in /in/2SqPM on line 5
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
poop Warning: session_start(): Cannot start session when headers already sent in /in/2SqPM on line 5
Output for 7.0.18 - 7.0.33, 7.1.4 - 7.1.33
poop Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/2SqPM:1) in /in/2SqPM on line 5 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/2SqPM:1) in /in/2SqPM on line 5
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.17, 7.1.0 - 7.1.3
poop Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/2SqPM:3) in /in/2SqPM on line 5 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/2SqPM:3) in /in/2SqPM on line 5

preferences:
176.38 ms | 403 KiB | 329 Q