// 生成n个随机数，要求n个数的和等于100
function lessANumber(n, v) {
    var i,
        s = 0,
        r = [],
        x = v;
    for (i = 1; i < n; i++) {
        x = Math.random() * x;
        r.push(x.toFixed(0));
        s += x;
        x = v - s;
    }
    r.push(x.toFixed(0));
    return r;
}

function foo($n ,$max = 100){
    $array = $zero = $normal = [];
    for($i=1;$i<=$n;$i++){
        $array[] = mt_rand(0,100);
    }
    $k = $max / array_sum($array);  //求出放大系数k
    foreach($array as $key => $val){
        $value = floor($val * $k); //直接保留整数，以保证下一步的和肯定<100
        if($value<1){
            $zero[] = $value;
        }else{
            $normal[] = $value;
        }
    }
    $sum = array_sum($normal);
    $diff = $max - $sum; //这个值肯定<100
    if(!empty($zero)){ //如果有为0的值
        $count = count($zero);
        foreach($zero as $z){
            $normal[] = $diff / $count;
        }
    }else{ //随机分配给一个人
        $key = array_rand($normal);
        $normal[$key] = $normal[$key]+$diff;
    }
    unset($array,$zero,$sum,$diff);
    return $normal;
}

function random($min = 0, $max = 1)
{
    return $min + mt_rand()/mt_getrandmax()*($max-$min);
}