1、程式碼如下：

 1 <?php
 2 /**
 3     * @file Pinyin.php
 4     * @author whx https://www.cnblogs.com/whx-blogs/
 5     * @date 2018/12/03 18:32:18
 6     * @brief
 7     *
 8 **/
 9 class PinyinClass {
10     /**
11      * [pinyin 轉換漢字的拼音首字母]
12      * @param  [type] $zh [漢字]
13      * @return [type]     [返回小寫字母]
 
14      */
15     public function pinyin($zh){
16         $ret = "";
17         $s1 = iconv("UTF-8","gb2312", $zh);
18         $s2 = iconv("gb2312","UTF-8", $s1);
19         if($s2 == $zh){$zh = $s1;}
20         for($i = 0; $i < strlen($zh); $i++){
21             $s1 = substr($zh,$i,1);
22             $p
 
 = ord($s1);
23             if($p > 160){
24                 $s2 = substr($zh,$i++,2);
25                 $ret .= $this->getfirstchar($s2);
26             }else{
27                 $ret .= $s1;
28             }
29         }
30         return strtolower($ret);
31     }
32 
33     /**
34
 
      * @name: getfirstchar
35      * @description: 獲取漢子首字母
36      * @param: string
37      * @return: mixed
38      * @author:
39      * @create: 2014-09-17 21:46:52
40     **/
41     private function getfirstchar($s0){
42         $fchar = ord($s0{0});
43         if($fchar >= ord("A") and $fchar <= ord("z") )return strtoupper($s0{0});
44         $s1 = $this->get_encoding($s0,'GB2312');
45         $s2 = $this->get_encoding($s1,'UTF-8');
46         if($s2 == $s0){$s = $s1;}else{$s = $s0;}
47         $asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
48         if($asc >= -20319 and $asc <= -20284) return "A";
49         if($asc >= -20283 and $asc <= -19776) return "B";
50         if($asc >= -19775 and $asc <= -19219) return "C";
51         if($asc >= -19218 and $asc <= -18711) return "D";
52         if($asc >= -18710 and $asc <= -18527) return "E";
53         if($asc >= -18526 and $asc <= -18240) return "F";
54         if($asc >= -18239 and $asc <= -17923) return "G";
55         if($asc >= -17922 and $asc <= -17418) return "I";
56         if($asc >= -17417 and $asc <= -16475) return "J";
57         if($asc >= -16474 and $asc <= -16213) return "K";
58         if($asc >= -16212 and $asc <= -15641) return "L";
59         if($asc >= -15640 and $asc <= -15166) return "M";
60         if($asc >= -15165 and $asc <= -14923) return "N";
61         if($asc >= -14922 and $asc <= -14915) return "O";
62         if($asc >= -14914 and $asc <= -14631) return "P";
63         if($asc >= -14630 and $asc <= -14150) return "Q";
64         if($asc >= -14149 and $asc <= -14091) return "R";
65         if($asc >= -14090 and $asc <= -13319) return "S";
66         if($asc >= -13318 and $asc <= -12839) return "T";
67         if($asc >= -12838 and $asc <= -12557) return "W";
68         if($asc >= -12556 and $asc <= -11848) return "X";
69         if($asc >= -11847 and $asc <= -11056) return "Y";
70         if($asc >= -11055 and $asc <= -10247) return "Z";
71         return null;
72     }
73 
74     /**
75      * @name: get_encoding
76      * @description: 自動檢測內容編碼進行轉換
77      * @param: string data
78      * @param: string to  目標編碼
79      * @return: string
80     **/
81     private function get_encoding($data,$to){
82         $encode_arr=array('UTF-8','ASCII','GBK','GB2312','BIG5','JIS','eucjp-win','sjis-win','EUC-JP');
83         $encoded=mb_detect_encoding($data, $encode_arr);
84         $data = mb_convert_encoding($data,$to,$encoded);
85         return $data;
86     }
87 
88 }
89 
90 $Obj = new PinyinClass();
91 $str = '我是中國人';
92 echo "漢字：" . $str . "<br>";
93 echo '拼音首字母：' . $Obj->pinyin($str);

2、執行結果：