참고 : 아래의 getThumbnail 함수는 zbxe/modules/document/document.item.php 에 위치합니다

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        function getThumbnail($width = 80,$height = 80) {
            // 문서의 이미지 첨부파일 위치를 구함
            $document_path = sprintf('./files/attach/images/%d/%d/',$this->get('module_srl'), $this->get('document_srl'));
            if(!is_dir($document_path)) FileHandler::makeDir($document_path);

            // 썸네일 임시 파일명을 구함
            $thumbnail_file = sprintf('%sthumbnail_%d.jpg', $document_path, $width);

            // 썸네일이 있더라도 글의 수정시간과 비교해서 다르면 다시 생성함
            if(file_exists($thumbnail_file)) {
                $file_created_time = date("YmdHis",filemtime($thumbnail_file));
                $modified_time = $this->get('last_update');
                if($modified_time > $file_created_time) @unlink($thumbnail_file);
            }

            if(file_exists($thumbnail_file)&&filesize($thumbnail_file)<1) return;

            // 썸네일 파일이 있으면 url return
            if(file_exists($thumbnail_file)) return Context::getRequestUri().$thumbnail_file;
           
            // 생성 시작
            FileHandler::writeFile($thumbnail_file, '', 'w');

            // 첨부파일이 있는지 확인하고 있으면 썸네일 만듬
            $oFile = &getModel('file');
            $file_list = $oFile->getFiles($this->document_srl);
            if(count($file_list)) {
                foreach($file_list as $file) {
                    if($file->direct_download!='Y') continue;
                    if(!eregi("(jpg|png|jpeg|gif)$",$file->source_filename)) continue;

                    $filename = $file->uploaded_filename;
                    if(!file_exists($filename)) continue;

                    FileHandler::createImageFile($filename, $thumbnail_file, $width, $height, 'jpg');
                    if(file_exists($thumbnail_file)) return Context::getRequestUri().$thumbnail_file;
                }
            }

            // 첨부파일이 없으면 내용에서 추출
            $content = $this->get('content');

            preg_match_all("!http:\/\/([^ ^\"^']*?)\.(jpg|png|gif|jpeg)!is", $content, $matches, PREG_SET_ORDER);
            for($i=0;$i<count($matches);$i++) {
                $src = $matches[$i][0];
                if(strpos($src,"/common/tpl")!==false || strpos($src,"/modules")!==false) continue;
                break;
            }

            $tmp_file = sprintf('%sthumbnail_%d.tmp.jpg', $document_path, $width);

            if($src) FileHandler::getRemoteFile($src, $tmp_file);
            else {
                FileHandler::writeFile($thumbnail_file,'');
                return;
            }

            FileHandler::createImageFile($tmp_file, $thumbnail_file, $width, $height, '+ '+ 'jpg');
            @unlink($tmp_file);

            return Context::getRequestUri().$thumbnail_file;
        }