分享一个PHP字符串截取函数，支持中文和其他编码。

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<?php   /** +---------------------------------------------------------- * 字符串截取，支持中文和其他编码 +---------------------------------------------------------- * @static * @access public +---------------------------------------------------------- * @param string $str 需要转换的字符串 * @param string $start 开始位置 * @param string $length 截取长度 * @param string $charset 编码格式 * @param string $suffix 截断显示字符 +---------------------------------------------------------- * @return string +---------------------------------------------------------- */ function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) {     if(function_exists("mb_substr"))         return mb_substr($str, $start, $length, $charset);     elseif(function_exists("iconv_substr")) {         return iconv_substr($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);     $slice = implode("",array_slice($match[0], $start, $length));     if ($suffix) return $slice."..."; else return $slice; }   ?>