3v4l.org

run code in 300+ PHP versions simultaneously
<?php $host = '0.0.0.0:'; $pos = strrpos($host, ':'); $port = substr($host, $pos + 1); var_dump($pos); var_dump($port);
Output for 7.1.25 - 7.1.30, 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
int(7) string(0) ""

preferences:
162.76 ms | 403 KiB | 168 Q