How can debugging be used to troubleshoot issues with unlink in PHP?

When troubleshooting issues with unlink in PHP, debugging can be used to identify the root cause of the problem. This can involve checking file permissions, file paths, or ensuring that the file exists before attempting to delete it. By using debugging techniques such as printing out variables or using a debugger tool, you can pinpoint where the issue lies and make the necessary adjustments to resolve it.

$file_path = 'example.txt';

if (file_exists($file_path)) {
    if (unlink($file_path)) {
        echo 'File deleted successfully.';
    } else {
        echo 'Unable to delete file.';
    }
} else {
    echo 'File does not exist.';
}