public static function get_rand($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, $proSum);
if ($randNum <= $proCur) {
$result = $key;
break;
} else {
$proSum -= $proCur;
}
}
unset ($proArr);
return $result;
}
传入的数组
$prize_arr = array(
"0" => array("id"=>"a","prize"=>"0.5元红包","v"=>25),
"1" => array("id"=>"b","prize"=>"平台券","v"=>50),
"2" => array("id"=>"c","prize"=>"1元红包","v"=>15),
"3" => array("id"=>"d","prize"=>"5元红包","v"=>10),
"4" => array("id"=>"e","prize"=>"618元红包","v"=>0)
);
其中 id 是最终返回的值, v表示中奖的百分比
mt_rand($price_all)
