What are common reasons for PHP include statements not working on a server compared to a local environment?

Common reasons for PHP include statements not working on a server compared to a local environment include incorrect file paths, file permission issues, and differences in server configurations. To solve this issue, ensure that the file paths in the include statements are correct and that the included files have the appropriate permissions set. Additionally, check for any differences in server configurations that may be affecting the include functionality.

<?php
include_once('/path/to/include/file.php');
?>