3v4l.org

run code in 500+ PHP versions simultaneously
<?php $className = 'Exception'; $result = substr($className, 0, -strlen($className) - 1); var_dump($result);
Output for 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
string(0) ""
Output for 7.4.33
bool(false)
preferences:
47.83 ms | 863 KiB | 4 Q