Are there any specific PHP functions or techniques that can be used to enhance the security of file deletion operations in a PHP script?

When deleting files in a PHP script, it is important to ensure that only authorized users can perform the operation and that the file being deleted is validated to prevent malicious file deletions. One way to enhance the security of file deletion operations is by using PHP's `unlink()` function along with checking user permissions and validating the file path before deletion.

// Check if user is authorized to delete the file
if($user_is_authorized) {
    $file_path = '/path/to/file.txt';

    // Validate the file path before deletion
    if(file_exists($file_path)) {
        unlink($file_path);
        echo "File deleted successfully.";
    } else {
        echo "File does not exist.";
    }
} else {
    echo "Unauthorized access.";
}