微信领红包问题

<?php
//随机小数
function randomFloat($min = 0, $max = 1) {
    return $min + mt_rand() / mt_getrandmax() * ($max - $min);
}


function raffle()
{
    $total = 100;
    $num = 10;
    $leftTotal = 100;
    $leftNum = 10;
    $minLimit = 0.01;

    for($i=0;$i<$num;$i++)
    {
        if (1 == $leftNum) {
            $money = $leftTotal;
            echo $money."\n";
            break;
        }
        $money = randomFloat($minLimit,$leftTotal/$leftNum*2);
        echo $money."\n";
        $leftTotal -= $money;
        $leftNum --;
    }

}

raffle();