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php获取字符串首字母

时间:2016-10-10 17:13:12  来源:  作者:

php获取字符串首字母

    /**
     * 获取字符串首字母
     * @param string $str 字符串
     * @return string
     */
    public static function getFirstchar($str){
        $firstchar_ord=ord(strtoupper($str{0}));
        if (($firstchar_ord>=65 and $firstchar_ord<=91)or($firstchar_ord>=48 and $firstchar_ord<=57)) return $str{0};
        $s=iconv("UTF-8","gb2312", $str);
        $asc=ord($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 "Z";
    }

 

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