同事说的一道面试题
function r($data){
$n = rand(0,100);
$temp = 0;
foreach ($data as $k => $v) {
$temp+=$v;
if($n<=$temp)
{
return $k;
}
}
return false;
}
$r = r(["t"=>0.1,"1"=>0.5,"2"=>1.5,"3"=>10,"4"=>20]);
echo $r==false?"未中奖":$r."等奖";
原文：https://www.cnblogs.com/samxiong/p/10923556.html