How can PHP developers troubleshoot and debug issues related to file downloads on their websites?

When troubleshooting file download issues on websites, PHP developers can check for errors in the file path, permissions, and headers. They can also use functions like `file_exists()` and `is_readable()` to ensure the file is accessible. Additionally, setting the correct content type and headers using `header()` function can help resolve download problems. 

$file_path = '/path/to/file.pdf';

if (file_exists($file_path) && is_readable($file_path)) {
    header('Content-Type: application/pdf');
    header('Content-Disposition: attachment; filename="downloaded.pdf"');
    readfile($file_path);
    exit;
} else {
    echo 'File not found or inaccessible.';
}

Keywords

PHP file downloads troubleshooting debugging error handling

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