What are some potential reasons for a web server not functioning properly on an Android device when running PHP files?

The web server on an Android device may not be functioning properly when running PHP files due to issues with the server configuration, PHP installation, or file permissions. To solve this issue, you can try restarting the web server, checking the PHP installation and configuration, and ensuring that the file permissions are set correctly.

// Sample PHP code snippet to check PHP installation and configuration
<?php
phpinfo();
?>