解析​PHP获取标题的拼音首字母（附代码示例）

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获取标题的拼音首字母

这里需要注意的是 x 的 ascii 值的区间，有可能会出现判断为空的情况，已做修改。

一、通过计算 ascii 码值对比字母的 ascii 码值得出。

    public function getfirstchar($s0)
    {
        $fchar = ord($s0{0});
        if($fchar >= ord("A") and $fchar <= ord("z") ) return strtoupper($s0{0});
        $s1 = mb_convert_encoding($s0,"GBK","UTF-8");//iconv("UTF-8","GBK", $s0);
        $s2 = mb_convert_encoding($s1,"UTF-8","GBK");//iconv("GBK","UTF-8", $s1);
        if($s2 == $s0){$s = $s1;}else{$s = $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 >= -17922 and $asc <= -17418) return "i";
        if($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 >= -22605 and $asc <= -11848) return "x";
        if($asc >= -11847 and $asc <= -11056) return "y";
        if($asc >= -11055 and $asc <= -10247) return "z";
        return NULL;
    }

二。获取整个标题的拼音首字母

    public function pinyin_long($zh)
    {
        $ret = "";
        if(empty($zh))
        {
            $ret="x";
        }else{
            $s1 = mb_convert_encoding($zh,"GBK","UTF-8");
            $s2 = mb_convert_encoding($s1,"UTF-8","GBK");
            if($s2 == $zh){$zh = $s1;}
            for($i = 0; $i < strlen($zh); $i++){
                $s1 = substr($zh,$i,1);
                $p = ord($s1);
                if($p > 160){
                    $s2 = substr($zh,$i++,2);
                    $ret .= $this->getfirstchar($s2);
                }else{
                    $ret .= $s1;
                }
            }
        }
        return $ret;
    }

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