// Assume we have a database table called 'messages' with fields: id, sender_id, receiver_id, message_content, and date_sent // First, find the message to be deleted $message_id = 12345; // this is the ID of the message to be deleted, passed in from the user interface $query = "SELECT * FROM messages WHERE id = $message_id LIMIT 1"; $result = mysqli_query($connection, $query); $message = mysqli_fetch_assoc($result); // Next, check if the message sender matches the current user if ($message['sender_id'] == $current_user_id) { // If they match, delete the message from the database $delete_query = "DELETE FROM messages WHERE id = $message_id LIMIT 1"; mysqli_query($connection, $delete_query); echo "Message deleted successfully."; } else { // If they don't match, show an error message echo "You are not authorized to delete this message."; }This code assumes that the $current_user_id variable contains the ID of the user who is currently logged in. It also assumes that the $connection variable has been set up to establish a connection to the database. The package/library for implementing this functionality would depend on the specific framework or CMS being used. For example, if using Laravel, one could use the Eloquent ORM to manage database interactions and user authentication. If using WordPress, one could use the WPDB class to access the database and check user permissions.