根据正则去掉自己不想要的html代码，看下面代码理解意思。
function cutstr_html($string){
$string = preg_replace('#<script[^>]*?>.*?</script>#si','',$string);
$string = preg_replace('#<style[^>]*?>.*?</style>#si','',$string);
$string = strip_tags($string);
$string = trim($string);
$string = str_replace("\t","",$string);
$string = str_replace("\r\n","",$string);
$string = str_replace("\r","",$string);
$string = str_replace("\n","",$string);
$string = str_replace(" ","",$string);
return trim($string);
}