PHP去除文章的html格式

function cutstr_html($string,$length=0,$ellipsis='…'){
$string=strip_tags($string);
$string=preg_replace('/\n/is','',$string);
$string=preg_replace('/ |　/is','',$string);
$string=preg_replace('/ /is','',$string);
preg_match_all("/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/",$string,$string);        if(is_array($string)&&!empty($string[0])){
if(is_numeric($length)&&$length){
$string=join('',array_slice($string[0],0,$length)).$ellipsis;
}else{
$string=implode('',$string[0]);
}
}else{
$string='';        }
return $string;
}
function clearHtml($content)
{
$content = preg_replace("/<a[^>]*>/i", "", $content);
@$content = preg_replace("/<\/a>/i", "", $content);
$content = preg_replace("/<div[^>]*>/i", "", $content);
@$content = preg_replace("/<\/div>/i", "", $content);
$content = preg_replace("/<!--[^>]*-->/i", "", $content);//注释内容
$content = preg_replace("/style=.+?['|\"]/i", '', $content);//去除样式
$content = preg_replace("/class=.+?['|\"]/i", '', $content);//去除样式
$content = preg_replace("/id=.+?['|\"]/i", '', $content);//去除样式
$content = preg_replace("/lang=.+?['|\"]/i", '', $content);//去除样式
$content = preg_replace("/width=.+?['|\"]/i", '', $content);//去除样式
$content = preg_replace("/height=.+?['|\"]/i", '', $content);//去除样式
$content = preg_replace("/border=.+?['|\"]/i", '', $content);//去除样式
$content = preg_replace("/face=.+?['|\"]/i", '', $content);//去除样式
$content = preg_replace("/face=.+?['|\"]/", '', $content);//去除样式 只允许小写 正则匹配没有带 i 参数
return $content;
}