Role Based Access controll

Courtesy:: http://phpmaster.com/role-based-access-control-in-php/

CREATE TABLE roles (
  role_id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
  role_name VARCHAR(50) NOT NULL,

  PRIMARY KEY (role_id)
);

CREATE TABLE permissions (
  perm_id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
  perm_desc VARCHAR(50) NOT NULL,

  PRIMARY KEY (perm_id)
);

CREATE TABLE role_perm (
  role_id INTEGER UNSIGNED NOT NULL,
  perm_id INTEGER UNSIGNED NOT NULL,

  FOREIGN KEY (role_id) REFERENCES roles(role_id),
  FOREIGN KEY (perm_id) REFERENCES permissions(perm_id)
);

CREATE TABLE user_role (
  user_id INTEGER UNSIGNED NOT NULL,
  role_id INTEGER UNSIGNED NOT NULL,

  FOREIGN KEY (user_id) REFERENCES users(user_id),
  FOREIGN KEY (role_id) REFERENCES roles(role_id)
);
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