织梦内容页做熊掌号有图片就输出三张，没有就不输出

/** *  文章内容提取图片(多张)自定义输出 *    织梦模板网  * @access    public * @param     string  $string  文档内容 * @param     string  $num  输出几张 * @return    string */if(!function_exists('getBodypics')){function getBodypics($string, $num){global $cfg_basehost;preg_match_all("/<img([^>]*)/s*src=('|/")([^'/"]+)('|/")/",$string,$matches);$imgsrc_arr = array_unique($matches[3]);$count = count($imgsrc_arr);$i = 0;$result = '';foreach($imgsrc_arr as $imgsrc){if($i == $num) break;$result .= ($result=='' ? '"'.$cfg_basehost.$imgsrc.'"' : ','.'"'.$cfg_basehost.$imgsrc.'"');$i++;}return $result;}}

<link rel="canonical" href="{dede:global.cfg_basehost/}{dede:field.id runphp=yes}$result=GetOneArchive(@me);@me=$result['arcurl'];{/dede:field.id}"><script src="//msite.baidu.com/sdk/c.js?appid=1608633444348086"></script><script type="application/ld+json">{"@context": "https://ziyuan.baidu.com/contexts/cambrian.jsonld","@id": "{dede:global.cfg_basehost/}{dede:field.id runphp=yes}$result=GetOneArchive(@me);@me=$result['arcurl'];{/dede:field.id}","appid": "1608633444348086","title": "{dede:field.title/}","images": [{dede:field.body function=getBodypics(@me,3)/}],"description": "{dede:field.description function=html2text(@me)/}","pubDate": "{dede:field.pubdate function="MyDate('Y-m-d/TH:i:s',@me)"/}"}</script>