/**
 * [format_every 换算进制到指定单位]
 * @param  integer  $number [需要换算数值]
 * @param  integer $ary    [每个单位之间的进制]
 * @param  array   $units  [每个单位的描述]
 * @return [String]          [格式化结果]
 */
function format_every($number,$ary = 100,$units = array('铜', '银', '金')) {
  $format = '';
  $prev = 0;
  for($i = count($units) - 1 ; $i >= 0 ; $i--){
    if($next = floor($number / pow($ary, $i))){
      $format .= $next - $prev * $ary . $units[$i];
    }
    $prev = $next;
  }
  return $format;
}
//简单点的
print_r(format_every(12345678));//1234金56银78铜
//假如1坨=100金,则:
print_r(format_every(12345678,100,array('铜', '银', '金','坨')));//12坨34金56银78铜
//字节换算
print_r(format_every(123456789,1024,array('B', 'KB', 'MB', 'GB', 'TB', 'PB')));//117MB755KB277B

function exchange($copper)
{
    $gold = (int) ($copper / 10000);
    $silver = (int) ($copper / 100 - $gold * 100);
    $copper = $copper % 100;
    
    return array($gold, $silver, $copper);
}

简单做。从额数最大的金开始处理，先整除，再模除，金银铜依次处理。输出的时候判断再做个判断，代码如下：

<?php
    function level($money){
        $gold   = floor($money / 10000);
        $money  = $money % 10000;

        $sliver = floor($money / 100);
        $cu     = $money % 100;

        $result = "";
        if($gold > 0) {
            $result .= $gold ."金";
        }
        if($sliver > 0) {
            $result .= $sliver ."银";    
        }
        if($cu > 0) {
            $result .= $cu ."铜";    
        }

        return $result;
    }

    //test
    echo level(102135);
    echo "<hr>";
    echo level(1544);
    echo "<hr>";
    echo level(99);

function level($money){
    $ag = floor($money /100);
    $cu = $money % 100;
    $golden = floor($ag / 100);
    $ag =   $ag % 100;
    echo "{$golden}金{$ag}银{$cu}铜币";
}

很简单的写了一个。

def make_change(money, coins)
  dp = [0]
  path = []
  result = {}

  coins.each_with_index do |coin, index|
    coin.upto(money) do |i|
      if !dp[i - coin].nil? && (dp[i].nil? || dp[i - coin] + 1 < dp[i])
        dp[i] = dp[i - coin] + 1
        coins[index] += 1
        path[i] = i - coin
      end
    end
  end

  if path[money].nil?
    puts "impossible." and return
  end

  i = money
  loop do
    break if path[i].nil?
    result[i - path[i]] ||= 0
    result[i - path[i]]  += 1
    i = path[i]
  end

  p result # 具体解
end

make_change(102135, [10000, 100, 1])
# => {1=>35, 100=>21, 10000=>10}

嗯...不知道计算速度快 还是字符串截取速度快

<?php
$money = 102135;
convert_money($money);

function convert_money($money) {
    $money = (string)$money;
    $coppers = substr($money,-2) ? substr($money,-2) : 0;
    $silver = substr($money,-4,-2) ? substr($money,-4,-2) : 0;
    $glod = substr($money,0,-4) ? substr($money,0,-4) : 0;

    echo "{$glod}金币{$silver}铜币{$coppers}银币";
}

结果： 10金币21铜币35银币

function change($number){

    static $jin;
    static $yin;
    static $ton;
    if($number >= pow(10,4)){
        $jin = intval($number/pow(10,4));
        change($number -$jin*pow(10,4));
    }else if($number >= pow(10,2)){
        $yin = intval($number/pow(10,2));
        change($number-$yin*pow(10,2));
    }else{
        $ton = $number;
    }

    return array($jin,$yin,$ton);
}

$number = 10110245;
print_r(change($number));

/**
 * @param $coins int 币数
 * @return string 格式化信息
 */
function coinFormatter($coins)
{
    $coins = intval($coins);
    $jin   = intval($coins/10000);
    $yin   = intval($coins/100 - $jin*100);
    $tong = $coins%100;

    $info = '';
    if($jin>0) {
        $info = $jin . "金";
    }
    if($yin>0){
        $info = $info.$yin."银";
    }
    if($tong >0){
        $info = $info.$tong."铜";
    }

    return $info;
}

echo coinFormatter(114523);
echo "\n";
echo coinFormatter(523);
echo "\n";
echo coinFormatter(3);
/*
输出结果：
11金45银23铜
5银23铜
3铜
*/

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