3v4l.org

run code in 300+ PHP versions simultaneously
<?php function myCallback($buffer, $flags) { if ($flags & PHP_OUTPUT_HANDLER_START) { exit('Server: LastMinuteHeaderServer'); } } ob_start('myCallback'); echo "Hello World!"; ob_end_flush();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Hello World!Server: LastMinuteHeaderServer
Output for 5.4.7 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.1 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0
Process exited with code 255.
Output for 7.0.0
Catchable fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0
Process exited with code 255.
Output for 5.4.0 - 5.4.6
Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0
preferences:
223.52 ms | 401 KiB | 271 Q