What steps can be taken to troubleshoot and resolve PHP code issues related to file inclusion?

To troubleshoot and resolve PHP code issues related to file inclusion, you can check the file paths, ensure the files exist, and verify correct permissions. Additionally, using absolute paths and using the correct include/require functions can help resolve these issues.

// Example PHP code snippet to include a file using absolute path
include_once(__DIR__ . '/path/to/file.php');