How can a PHP developer troubleshoot and resolve issues with file uploads in PHP, especially when dealing with large files?

When dealing with file uploads in PHP, especially with large files, a common issue is hitting the maximum file size or execution time limits set in the php.ini file. To resolve this, a PHP developer can increase the values of `upload_max_filesize`, `post_max_size`, and `max_execution_time` in the php.ini file or override them in the PHP script using `ini_set()` function.

// Increase file upload limits
ini_set('upload_max_filesize', '20M');
ini_set('post_max_size', '25M');
ini_set('max_execution_time', 300);