一个很好的中文截取字符窜函数

无详细内容 无 源码与演示： 源码出处演示出处 function cut_str($string,$sublen,$filter=true,$start=0,$code='UTF-8'){if($filter) $string=Html2Text($string);if($code=='UTF-8'){$pa="/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[

源码与演示：源码出处 演示出处

function cut_str($string,$sublen,$filter=true,$start=0,$code='UTF-8'){
    if($filter) $string=Html2Text($string);
    if($code=='UTF-8'){
        $pa="/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
        preg_match_all($pa,$string,$t_string);
        if(count($t_string[0])-$start>$sublen) return join('',array_slice($t_string[0],$start,$sublen))."...";
        return join('',array_slice($t_string[0],$start,$sublen));
    }else{
        $start=$start*2;
        $sublen=$sublen*2;
        $strlen=strlen($string);
        $tmpstr='';
        for($i=0;$i<$strlen;$i++){
            if($i>=$start&&$i<($start+$sublen)){
                if(ord(substr($string,$i,1))>129){
                    $tmpstr.=substr($string,$i,2);
                }else{
                    $tmpstr.=substr($string,$i,1);
                }
            }
            if(ord(substr($string,$i,1))>129) $i++;
        }
        if(strlen($tmpstr)<$strlen ) $tmpstr.="...";
        return $tmpstr;
    }
}
function Html2Text($str){
    $str = preg_replace("/<sty(.*)\\/style>|<scr(.*)\\/script>|<!--(.*)-->/isU","",$str);
    $alltext = "";
    $start = 1;
    for($i=0;$i<strlen($str);$i++){
        if($start==0 && $str[$i]==">"){
            $start = 1;
        }else if($start==1){
            if($str[$i]=="<"){
                $start = 0;
                $alltext .= " ";
            }else if(ord($str[$i])>31){
                $alltext .= $str[$i];
            }
        }
    }
    $alltext = str_replace("　"," ",$alltext);
    $alltext = preg_replace("/&([^;&]*)(;|&)/","",$alltext);
    $alltext = preg_replace("/[ ]+/s"," ",$alltext);
    return $alltext;
}