ThinkPHP截取部分文章文字、字符串

ThinkPHP有一个内置字符截取函数msubstr()如下：

msubstr($str, $start=0, $length, $charset=”utf-8″, $suffix=true) 
$str:要截取的字符串 
$start=0：开始位置，默认从0开始 
$length：截取长度 
$charset=”utf-8″：字符编码，默认UTF－8 
$suffix=true：是否在截取后的字符后面显示省略号，默认true显示，false为不显示 

在function.php定义msubstr函数

function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true){
    if(function_exists("mb_substr")){
        if($suffix){
            return mb_substr($str, $start, $length, $charset)."...";
        }else{
            return mb_substr($str, $start, $length, $charset);
        }
    }elseif(function_exists("iconv_substr")) {
        if($suffix){
            return iconv_substr($str,$start,$length,$charset)."...";
        }else{
            return iconv_substr($str,$start,$length,$charset);
        }
    }
    $re["utf-8"]   = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";
    $re["gb2312"] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";
    $re["gbk"]    = "/[x01-x7f]|[x81-xfe][x40-xfe]/";
    $re["big5"]   = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";
    preg_match_all($re[$charset], $str, $match);
    $slice = join("",array_slice($match[0], $start, $length));
    if($suffix){
        return $slice."...";
    }else{
        return $slice;
    }
}

调用该函数：

{$vo["title"]|msubstr=5,5,"utf-8",false}

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