class UserRole { private $db; // Constructor to initialize database connection function __construct($conn) { $this->db = $conn; } // Define method to create a new user role public function createRole($name, $description) { try { $stmt = $this->db->prepare("INSERT INTO user_roles(role_name, description) VALUES(:name, :description)"); $stmt->bindparam(":name", $name); $stmt->bindparam(":description", $description); $stmt->execute(); return true; } catch(PDOException $e) { echo $e->getMessage(); return false; } } // Define method to get a user role by ID public function getRoleById($id) { $stmt = $this->db->prepare("SELECT * FROM user_roles WHERE id=:id"); $stmt->execute(array(":id"=>$id)); $role = $stmt->fetch(PDO::FETCH_ASSOC); return $role; } // Define method to update a user role by ID public function updateRole($id, $name, $description) { try { $stmt = $this->db->prepare("UPDATE user_roles SET role_name=:name, description=:description WHERE id=:id"); $stmt->bindparam(":id", $id); $stmt->bindparam(":name", $name); $stmt->bindparam(":description", $description); $stmt->execute(); return true; } catch(PDOException $e) { echo $e->getMessage(); return false; } } // Define method to delete a user role by ID public function deleteRole($id) { try { $stmt = $this->db->prepare("DELETE FROM user_roles WHERE id=:id"); $stmt->bindparam(":id", $id); $stmt->execute(); return true; } catch(PDOException $e) { echo $e->getMessage(); return false; } } // Define method to check if a user has a certain role public function checkUserRole($userid, $role) { $stmt = $this->db->prepare("SELECT COUNT(*) FROM user_roles INNER JOIN users ON user_roles.id=users.role_id WHERE users.id=:userid AND user_roles.role_name=:role"); $stmt->execute(array(":userid"=>$userid, ":role"=>$role)); if($stmt->fetchColumn() > 0) { return true; } else { return false; } } }This code shows a User Roles model that uses PDO for database connection and has methods to create, read, update and delete user roles. It also has a method to check if a user has a certain role. Package library: The package library for a User Roles model in PHP can be any of the many PHP libraries available for database connections and management, such as PDO, MySQLi, Doctrine etc. These libraries provide convenient methods and classes for working with databases, making it easier to write clean and optimized code.