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获取首字符拼音首字母
2018/07/20 Code PHP
/**
 * 获取首字符拼音首字母
 *
 * 判断是否为汉字 !preg_match("/^[x{4e00}-x{9fa5}]+$/u", $s0)
 * 已知 “泸”,无法识别
 */
function getFirstPing($str)
{
    $s0 = mb_substr($str, 0, 1, "utf-8");
    $fchar = ord($s0{0});
    if ($fchar >= ord("A") and $fchar <= ord("z")) return strtoupper($s0{0});
    $s1 = iconv("UTF-8", "gb2312", $s0);
    $s2 = iconv("gb2312", "UTF-8", $s1);
    if ($s2 == $s0) {
        $s = $s1;
    } else {
        $s = $s0;
    }
    $asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
    if ($asc >= -20319 && $asc <= -20284) return "A";
    if ($asc >= -20283 && $asc <= -19776) return "B";
    if ($asc >= -19775 && $asc <= -19219) return "C";
    if ($asc >= -19218 && $asc <= -18711) return "D";
    if ($asc >= -18710 && $asc <= -18527) return "E";
    if ($asc >= -18526 && $asc <= -18240) return "F";
    if ($asc >= -18239 && $asc <= -17923) return "G";
    if ($asc >= -17922 && $asc <= -17418) return "H";
    if ($asc >= -17922 && $asc <= -17418) return "I";
    if ($asc >= -17417 && $asc <= -16475) return "J";
    if ($asc >= -16474 && $asc <= -16213) return "K";
    if ($asc >= -16212 && $asc <= -15641) return "L";
    if ($asc >= -15640 && $asc <= -15166) return "M";
    if ($asc >= -15165 && $asc <= -14923) return "N";
    if ($asc >= -14922 && $asc <= -14915) return "O";
    if ($asc >= -14914 && $asc <= -14631) return "P";
    if ($asc >= -14630 && $asc <= -14150) return "Q";
    if ($asc >= -14149 && $asc <= -14091) return "R";
    if ($asc >= -14090 && $asc <= -13319) return "S";
    if ($asc >= -13318 && $asc <= -12839) return "T";
    if ($asc >= -12838 && $asc <= -12557) return "W";
    if ($asc >= -12556 && $asc <= -11848) return "X";
    if ($asc >= -11847 && $asc <= -11056) return "Y";
    if ($asc >= -11055 && $asc <= -10247) return "Z";
    return $s0;
}
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本文作者:Utone
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