//过滤HTML,空格，换行，截取，编码，
function my_nohtml_mbsubstr($str,$start=0,$end=50,$coded=‘utf-8‘){
$str=strip_tags($str);
$bf=array(" "," ","\t","\n","\r");
$lb=array("","","","","");
$str=str_replace($bf,$lb,$str);
return $str=mb_substr($str,$start,$end,$coded);
}
原文：http://www.cnblogs.com/OnlyLoveCx/p/5163843.html