php怎样获得汉字首字母

在PHP中获得汉字的首字母可以通过以下方法实现：

function getFirstChar($str){
    $firstChar = '';
    $s = iconv("UTF⑻", "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 >= ⑵0319 and $asc <= ⑵0284) {
            $firstChar = 'A';
        }
        if ($asc >= ⑵0283 and $asc <= ⑴9776) {
            $firstChar = 'B';
        }
        if ($asc >= ⑴9775 and $asc <= ⑴9219) {
            $firstChar = 'C';
        }
        if ($asc >= ⑴9218 and $asc <= ⑴8711) {
            $firstChar = 'D';
        }
        if ($asc >= ⑴8710 and $asc <= ⑴8527) {
            $firstChar = 'E';
        }
        if ($asc >= ⑴8526 and $asc <= ⑴8240) {
            $firstChar = 'F';
        }
        if ($asc >= ⑴8239 and $asc <= ⑴7923) {
            $firstChar = 'G';
        }
        if ($asc >= ⑴7922 and $asc <= ⑴7418) {
            $firstChar = 'H';
        }
        if ($asc >= ⑴7417 and $asc <= ⑴6475) {
            $firstChar = 'J';
        }
        if ($asc >= ⑴6474 and $asc <= ⑴6213) {
            $firstChar = 'K';
        }
        if ($asc >= ⑴6212 and $asc <= ⑴5641) {
            $firstChar = 'L';
        }
        if ($asc >= ⑴5640 and $asc <= ⑴5166) {
            $firstChar = 'M';
        }
        if ($asc >= ⑴5165 and $asc <= ⑴4923) {
            $firstChar = 'N';
        }
        if ($asc >= ⑴4922 and $asc <= ⑴4915) {
            $firstChar = 'O';
        }
        if ($asc >= ⑴4914 and $asc <= ⑴4631) {
            $firstChar = 'P';
        }
        if ($asc >= ⑴4630 and $asc <= ⑴4150) {
            $firstChar = 'Q';
        }
        if ($asc >= ⑴4149 and $asc <= ⑴4091) {
            $firstChar = 'R';
        }
        if ($asc >= ⑴4090 and $asc <= ⑴3319) {
            $firstChar = 'S';
        }
        if ($asc >= ⑴3318 and $asc <= ⑴2839) {
            $firstChar = 'T';
        }
        if ($asc >= ⑴2838 and $asc <= ⑴2557) {
            $firstChar = 'W';
        }
        if ($asc >= ⑴2556 and $asc <= ⑴1848) {
            $firstChar = 'X';
        }
        if ($asc >= ⑴1847 and $asc <= ⑴1056) {
            $firstChar = 'Y';
        }
        if ($asc >= ⑴1055 and $asc <= ⑴0247) {
            $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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