Define the prize probability array
private $innerRate = array(
'1' => 1,
'2' => 200,
'3' => 500,
'4' => 100000,
'5' => 300000,
'6' => 1693000,
);Call the function
1.$i = $this->getRand($this->innerRate);
2.Handle the result based on the returned $i; either if or switch works.
if($i==1)
{
echo "一等奖";
}else{
echo "二等奖";
}Base function
private function getRand($proArr)
{
$result = '';
// 概率数组的总概率精度
$proSum = array_sum($proArr);
// 概率数组循环
foreach ($proArr as $key => $proCur) {
$randNum = mt_rand(1, $proSum); // 抽取随机数
if ($randNum <= $proCur) {
$result = $key; // 得出结果
break;
} else {
$proSum -= $proCur;
}
}
unset($proArr);
return $result;
}
