小文字の数値を RMB の大文字の数値に変換する PHP 関数

RMB 数値を中国語の大文字に変換することは比較的一般的な要件であるため、将来必要になった場合に備えて、記録として機能をここで共有します。

function num2rmb ($num) {
    $c1 = "零壹贰叁肆伍陆柒捌玖";
    $c2 = "分角元拾佰仟万拾佰仟亿";
    $num = round($num, 2);
    $num = $num * 100;
    if (strlen($num) > 10) {
        return "oh,sorry,the number is too long!";
    }
    $i = 0;
    $c = "";
    while (1) {
        if ($i == 0) {
            $n = substr($num, strlen($num)-1, 1);
        } else {
            $n = $num % 10;
        }
        $p1 = substr($c1, 3 * $n, 3);
        $p2 = substr($c2, 3 * $i, 3);
        if ($n != '0' || ($n == '0' && ($p2 == '亿' || $p2 == '万' || $p2 == '元'))) {
            $c = $p1 . $p2 . $c;
        } else {
            $c = $p1 . $c;
        }
        $i = $i + 1;
        $num = $num / 10;
        $num = (int)$num;
        if ($num == 0) {
            break;
        }
    }
    $j = 0;
    $slen = strlen($c);
        while ($j < $slen) {
        $m = substr($c, $j, 6);
        if ($m == &#39;零元&#39; || $m == &#39;零万&#39; || $m == &#39;零亿&#39; || $m == &#39;零零&#39;) {
            $left = substr($c, 0, $j);
            $right = substr($c, $j + 3);
            $c = $left . $right;
            $j = $j-3;
            $slen = $slen-3;
        }
        $j = $j + 3;
    }
    if (substr($c, strlen($c)-3, 3) == &#39;零&#39;) {
        $c = substr($c, 0, strlen($c)-3);
    } // if there is a &#39;0&#39; on the end , chop it out
        return $c . "整";
}