PHP清除html、css、js格式并去除空格的PHP函数

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;
}