php如何获取字符串拼音首字母

例如：$str = '中华人民';

返回来 ZHRM；

下面是我百度的一个函数，但是有的情况会出错，例如： 重庆

返回来的是 ZQ

function getfirstchar($s0) {
        $firstchar_ord = ord(strtoupper($s0{0}));
        if (($firstchar_ord >= 65 and $firstchar_ord <= 91)or ( $firstchar_ord >= 48 and $firstchar_ord <= 57))
            return $s0{0};
        $s = iconv("UTF-8", "gb2312", $s0);
        $asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
        if ($asc >= -20319 and $asc <= -20284)
            return "A";
        if ($asc >= -20283 and $asc <= -19776)
            return "B";
        if ($asc >= -19775 and $asc <= -19219)
            return "C";
        if ($asc >= -19218 and $asc <= -18711)
            return "D";
        if ($asc >= -18710 and $asc <= -18527)
            return "E";
        if ($asc >= -18526 and $asc <= -18240)
            return "F";
        if ($asc >= -18239 and $asc <= -17923)
            return "G";
        if ($asc >= -17922 and $asc <= -17418)
            return "H";
        if ($asc >= -17417 and $asc <= -16475)
            return "J";
        if ($asc >= -16474 and $asc <= -16213)
            return "K";
        if ($asc >= -16212 and $asc <= -15641)
            return "L";
        if ($asc >= -15640 and $asc <= -15166)
            return "M";
        if ($asc >= -15165 and $asc <= -14923)
            return "N";
        if ($asc >= -14922 and $asc <= -14915)
            return "O";
        if ($asc >= -14914 and $asc <= -14631)
            return "P";
        if ($asc >= -14630 and $asc <= -14150)
            return "Q";
        if ($asc >= -14149 and $asc <= -14091)
            return "R";
        if ($asc >= -14090 and $asc <= -13319)
            return "S";
        if ($asc >= -13318 and $asc <= -12839)
            return "T";
        if ($asc >= -12838 and $asc <= -12557)
            return "W";
        if ($asc >= -12556 and $asc <= -11848)
            return "X";
        if ($asc >= -11847 and $asc <= -11056)
            return "Y";
        if ($asc >= -11055 and $asc <= -10247)
            return "Z";
        return null;
    }

回复内容：

例如：$str = '中华人民';

返回来 ZHRM；

下面是我百度的一个函数，但是有的情况会出错，例如： 重庆

返回来的是 ZQ

function getfirstchar($s0) {
        $firstchar_ord = ord(strtoupper($s0{0}));
        if (($firstchar_ord >= 65 and $firstchar_ord <= 91)or ( $firstchar_ord >= 48 and $firstchar_ord <= 57))
            return $s0{0};
        $s = iconv("UTF-8", "gb2312", $s0);
        $asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
        if ($asc >= -20319 and $asc <= -20284)
            return "A";
        if ($asc >= -20283 and $asc <= -19776)
            return "B";
        if ($asc >= -19775 and $asc <= -19219)
            return "C";
        if ($asc >= -19218 and $asc <= -18711)
            return "D";
        if ($asc >= -18710 and $asc <= -18527)
            return "E";
        if ($asc >= -18526 and $asc <= -18240)
            return "F";
        if ($asc >= -18239 and $asc <= -17923)
            return "G";
        if ($asc >= -17922 and $asc <= -17418)
            return "H";
        if ($asc >= -17417 and $asc <= -16475)
            return "J";
        if ($asc >= -16474 and $asc <= -16213)
            return "K";
        if ($asc >= -16212 and $asc <= -15641)
            return "L";
        if ($asc >= -15640 and $asc <= -15166)
            return "M";
        if ($asc >= -15165 and $asc <= -14923)
            return "N";
        if ($asc >= -14922 and $asc <= -14915)
            return "O";
        if ($asc >= -14914 and $asc <= -14631)
            return "P";
        if ($asc >= -14630 and $asc <= -14150)
            return "Q";
        if ($asc >= -14149 and $asc <= -14091)
            return "R";
        if ($asc >= -14090 and $asc <= -13319)
            return "S";
        if ($asc >= -13318 and $asc <= -12839)
            return "T";
        if ($asc >= -12838 and $asc <= -12557)
            return "W";
        if ($asc >= -12556 and $asc <= -11848)
            return "X";
        if ($asc >= -11847 and $asc <= -11056)
            return "Y";
        if ($asc >= -11055 and $asc <= -10247)
            return "Z";
        return null;
    }

可以尝试使用这个拼音库:

http://overtrue.me/pinyin/
http://overtrue.me/articles/2014/10/php-chinese-to-pinyin.html

可以使用 http://overtrue.me/pinyin/，开源项目

多音字没办法解决，除非你自己写枚举排除