显示指定长度的标题

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

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