PHP \DesignPatterns\Behavioral\Visitor\Group \DesignPatterns\Behavioral\Visitor\Role \DesignPatterns\Behavioral\Visitor\RolePrintVisitor \DesignPatterns\Behavioral\Visitor\Group \DesignPatterns\Behavioral\Visitor\RoleVisitorInterface \DesignPatterns\Behavioral\Visitor\User Fields Constants Constructors Methods private