Zend_Acl_Role_Registry_Exception example

    public function add(Zend_Acl_Role_Interface $role, $parents = null)
    {
        $roleId = $role->getRoleId();

        if ($this->has($roleId)) {
            /** * @see Zend_Acl_Role_Registry_Exception */
            throw new Zend_Acl_Role_Registry_Exception("Role id '$roleId' already exists in the registry");
        }

        $roleParents = array();

        if (null !== $parents) {
            if (!is_array($parents)) {
                $parents = array($parents);
            }
            /** * @see Zend_Acl_Role_Registry_Exception */