mb_substr 文章截取

$frontcontent=$newssection_result->fields['post_content'];$frontcontent = str_replace(']]>', ']]>', $frontcontent);$pattern='/<img[^>]+./';$patternhref='/<a.+href=[\'"]([^\'"]+)[\'"].*>/i';$frontcontent = preg_replace($pattern,'', $frontcontent);$frontcontent = preg_replace($patternhref,'', $frontcontent);$frontcontent = strip_tags($frontcontent);//$contentrest = substr($frontcontent, 0, 101);$contentrest = mb_substr($frontcontent,0,80,'utf-8');