function setTitle($post_id, $title) { // Connect to database $conn = new mysqli('localhost', 'username', 'password', 'database_name'); // Prepare SQL statement $stmt = $conn->prepare("UPDATE posts SET title=? WHERE id=?"); $stmt->bind_param("si", $title, $post_id); // Execute SQL statement $stmt->execute(); // Close database connection $conn->close(); }In this example, the function accepts two parameters: `$post_id` and `$title`. `$post_id` is the ID of the blog post that needs its title updated, and `$title` is the new title for the post. The function connects to the database using `mysqli()`, prepares an SQL statement to update the `posts` table with the new title, and executes the statement. Finally, the function closes the database connection. Package Library: The package library used in this example is MySQLi, which is a PHP extension that provides an interface to MySQL databases.