3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo `start`; sleep(10); echo 'e...'; sleep(10); echo 'f...'; sleep(10); echo 'g...';
Output for 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: shell_exec(): Unable to execute 'start' in /in/VGNd3 on line 2
Process exited with code 137.
Output for 5.6.38, 7.1.21 - 7.1.22, 7.2.10

Process exited with code 137.

preferences:
113.04 ms | 401 KiB | 140 Q