基于时间的中奖几率算法

php代码

function getProb($startTime,$endTime)
{

	$curTime = time();

	if($curTime>$endTime || $curTimeget($memKey);
	$redis->setex($memKey,3600*24*20,$curTime);

	if(empty($prevTime) || $prevTime<$startTime) $prevTime = $startTime;

	$prob = round(($curTime - $prevTime)/($endTime - $prevTime),3);

	return $prob;
}



$num = 8;//剩余库存

$startTime = strtotime(date(&#39;Y-m-d 00:00:00&#39;));
$endTime = strtotime(date(&#39;Y-m-d 23:59:59&#39;));

$prob = getProb($startTime,$endTime);

$prob *= $num;

if(rand(0,1000)/1000<=$prob)
{
	echo &#39;ok&#39;;
}