public function delInterestGrouping($group_id = false)
    {

        $payload = array(
            'grouping_id' => (FALSE === $group_id) ? $this->grouping_id : $group_id
        );

        $apiCall = 'lists/interest-grouping-del';
        $data = $this->requestMonkey($apiCall, $payload);
        $data = json_decode($data, true);
        if (isset($data['error']))
            throw new MailchimpAPIException($data);
        else
            return true;
    }
public function delInterestGrouping($group_id = false)
    {

        $payload = array(
            'grouping_id' => (FALSE === $group_id) ? $this->grouping_id : $group_id
        );

        $apiCall = 'lists/interest-grouping-del';
        $data = $this->requestMonkey($apiCall, $payload);
        $data = json_decode($data, true);
        if (isset($data['error']))
            throw new MailchimpAPIException($data);
        else
            return true;
    }
public function delInterestGrouping ( $ group_id = false ) { $ payload = array ( 'grouping_id' => ( FALSE === $ group_id ) ? $ this -> grouping_id : $ group_id ) ; $ apiCall = 'lists/interest-grouping-del' ; $ data = $ this -> requestMonkey ( $ apiCall , $ payload ) ; $ data = json_decode ( $ data , true ) ; if ( isset ( $ data [ 'error' ] ) ) throw new MailchimpAPIException ( $ data ) ; else return true ; }
Delete an existing Interest Grouping - this will permanently delete all contained interest groups and will remove those selections from all list members

@link http://apidocs.mailchimp.com/api/2.0/lists/interest-grouping-del.php
@param int $group_id optional the interest grouping id
@return boolean true on success
@throws MailchimpAPIException
Delete an existing Interest Grouping - this will permanently delete all contained interest groups and will remove those selections from all list members