3v4l.org

run code in 300+ PHP versions simultaneously
<?php foreach(array(STDIN,STDOUT,STDERR,tmpfile()) as $resource){ var_dump(unserialize(serialize($resource))); }
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
int(0) int(0) int(0) int(0)

preferences:
206.65 ms | 403 KiB | 292 Q