untuk exist

    function exist($params=null){
        log_message("type:model |function:exist |file:dynamic_pages.php",'RunFunction');
        log_message("param:".json_encode($params)." |function:exist_param |file:dynamic_pages.php",'info');
        //return count($this->get_all(array('content_id' => $content_id))) == 1;
        $exist=false;
        log_message("exist param (start)| exist false ","debug");
        try {
            $filter=array();
//===========content_id
            if(is_array($params)){
                log_message("exist param (array) ","debug");
                $filter=$params;
                if(isset($params['id'])){
                    $filter['content_id']=$params['id'];
                    unset($filter['id']);
                    log_message("exist param | add content_id (array)","debug");
                }
                else{}
            }
            else{
                $filter['content_id']=$params;
                log_message("exist param | add content_id","debug");

            }


            if(isset($filter['content_id'])&&strlen($filter['content_id'])<24){
                log_message("exist param |content_id not valid |len:".strlen($filter['content_id']),"debug");
                return false;
            }
            log_message("exist param |param:".json_encode($params),"debug");
            $row= $this
                    ->get_all($filter,1);
            log_message("exist param | row:".json_encode($row),"debug");
            $exist=$row?true:false;

        }
        catch (Exception $e) {
            log_message("check result:false |filter:".json_encode($params),"error");
            $exist=false;
            log_message("exist param | exist false ","error");
            return false;
        }
        log_message("exist param | result ".json_encode($exist),"debug");
        return $exist;
    }