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PHP获取汉字的首字母

2013-07-27 14:14 232 查看
/**
 * PHP获取汉字的首字母
 * @param type $s0
 * @return string|null
 */
function get_letter($s0) {
    $firstchar_ord = ord(strtoupper($s0{0}));
    if (($firstchar_ord >= 65 and $firstchar_ord <= 91) or ($firstchar_ord >= 48 and $firstchar_ord <= 57))
        return $s0{0};
    $s = iconv("UTF-8", "gb2312", $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 >= -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 0;
}
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