php如何获取汉字首字母

在PHP中获取汉字的首字母可以通过以下方法实现：

function getFirstChar($str){
    
    $firstChar = '';
    
    $s = iconv("UTF-8", "gb2312", $str);

    if (preg_match("/^([A-Za-z])/", $str)) {
     //如果是英文字母直接返回
        return strtoupper($str[0]);

    }
    

    if (ord($str) >
 128) {
 //汉字
        $asc = ord($s{
0}
) * 256 + ord($s{
1}
    ) - 65536;
    
        if ($asc >
    = -20319 and $asc <
= -20284) {
    
            $firstChar = 'A';

        }
    
        if ($asc >
    = -20283 and $asc <
= -19776) {
    
            $firstChar = 'B';

        }
    
        if ($asc >
    = -19775 and $asc <
= -19219) {
    
            $firstChar = 'C';

        }
    
        if ($asc >
    = -19218 and $asc <
= -18711) {
    
            $firstChar = 'D';

        }
    
        if ($asc >
    = -18710 and $asc <
= -18527) {
    
            $firstChar = 'E';

        }
    
        if ($asc >
    = -18526 and $asc <
= -18240) {
    
            $firstChar = 'F';

        }
    
        if ($asc >
    = -18239 and $asc <
= -17923) {
    
            $firstChar = 'G';

        }
    
        if ($asc >
    = -17922 and $asc <
= -17418) {
    
            $firstChar = 'H';

        }
    
        if ($asc >
    = -17417 and $asc <
= -16475) {
    
            $firstChar = 'J';

        }
    
        if ($asc >
    = -16474 and $asc <
= -16213) {
    
            $firstChar = 'K';

        }
    
        if ($asc >
    = -16212 and $asc <
= -15641) {
    
            $firstChar = 'L';

        }
    
        if ($asc >
    = -15640 and $asc <
= -15166) {
    
            $firstChar = 'M';

        }
    
        if ($asc >
    = -15165 and $asc <
= -14923) {
    
            $firstChar = 'N';

        }
    
        if ($asc >
    = -14922 and $asc <
= -14915) {
    
            $firstChar = 'O';

        }
    
        if ($asc >
    = -14914 and $asc <
= -14631) {
    
            $firstChar = 'P';

        }
    
        if ($asc >
    = -14630 and $asc <
= -14150) {
    
            $firstChar = 'Q';

        }
    
        if ($asc >
    = -14149 and $asc <
= -14091) {
    
            $firstChar = 'R';

        }
    
        if ($asc >
    = -14090 and $asc <
= -13319) {
    
            $firstChar = 'S';

        }
    
        if ($asc >
    = -13318 and $asc <
= -12839) {
    
            $firstChar = 'T';

        }
    
        if ($asc >
    = -12838 and $asc <
= -12557) {
    
            $firstChar = 'W';

        }
    
        if ($asc >
    = -12556 and $asc <
= -11848) {
    
            $firstChar = 'X';

        }
    
        if ($asc >
    = -11847 and $asc <
= -11056) {
    
            $firstChar = 'Y';

        }
    
        if ($asc >
    = -11055 and $asc <
= -10247) {
    
            $firstChar = 'Z';

        }

    }
 else {
    
        $firstChar = strtoupper($str[0]);

    }
    

    return $firstChar;

}
    

$str = '你好世界';
    
echo getFirstChar($str);
     //输出 N

以上代码可以根据汉字的unicode码来判断首字母，返回结果为汉字拼音首字母的大写字母。

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