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眾所周知，php 自帶的 strlen 與 substr 函數(shù)沒法處理中文字符，于是，我們會(huì)用 mb_ 系列函數(shù)替代。但是，沒有 mbstring 庫怎么辦？這就需要我們自己寫一個(gè)來替代了，廢話不多說，先上代碼:

復(fù)制代碼代碼如下:

if ( !function_exists('mb_strlen') ) {
function mb_strlen ($text, $encode) {
  if ($encode=='UTF-8') {
   return preg_match_all('%(?:
       [\x09\x0A\x0D\x20-\x7E]           # ASCII
     | [\xC2-\xDF][\x80-\xBF]            # non-overlong 2-byte
     | \xE0[\xA0-\xBF][\x80-\xBF]       # excluding overlongs
     | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
     | \xED[\x80-\x9F][\x80-\xBF]       # excluding surrogates
     | \xF0[\x90-\xBF][\x80-\xBF]{2}    # planes 1-3
     | [\xF1-\xF3][\x80-\xBF]{3}         # planes 4-15
     | \xF4[\x80-\x8F][\x80-\xBF]{2}    # plane 16
     )%xs',$text,$out);
  }else{
   return strlen($text);
  }
}
}

/* from Internet, author unknown */
if (!function_exists('mb_substr')) {
    function mb_substr($str, $start, $len = '', $encoding="UTF-8"){
        $limit = strlen($str);

        for ($s = 0; $start > 0;--$start) {// found the real start
            if ($s >= $limit)
                break;

            if ($str[$s] <= "\x7F")
                ++$s;
            else {
                ++$s; // skip length

                while ($str[$s] >= "\x80" && $str[$s] <= "\xBF")
                    ++$s;
            }
        }

        if ($len == '')
            return substr($str, $s);
        else
            for ($e = $s; $len > 0; --$len) {//found the real end
                if ($e >= $limit)
                    break;

                if ($str[$e] <= "\x7F")
                    ++$e;
                else {
                    ++$e;//skip length

                    while ($str[$e] >= "\x80" && $str[$e] <= "\xBF" && $e < $limit)
                        ++$e;
                }
            }

        return substr($str, $s, $e - $s);
    }
}