<?php
include("config.php");//链接数据库
$prize_arr = array(
'0' => array('id'=>1,'min'=>55,'max'=>80,'prize'=>'3折抢购红酒木瓜丰胸靓汤 ','v'=>10),//弧度：55°-80°范围是：“3折抢购红酒木瓜丰胸靓汤”奖， v=10是中奖率是10%
'1' => array('id'=>2,'min'=>10,'max'=>35,'prize'=>'3折抢购自由呼吸魔泥金装精品套装','v'=>10),
'2' => array('id'=>3,'min'=>320,'max'=>355,'prize'=>'100元现金券','v'=>20),
'3' => array('id'=>4,'min'=>230,'max'=>265,'prize'=>'3折抢购218齿白健套装','v'=>10),
'4' => array('id'=>5,'min'=>185,'max'=>215,'prize'=>'3折抢购498元祛疤精华','v'=>10),
'5' => array('id'=>6,'min'=>140,'max'=>170,'prize'=>'300元现金券大礼包','v'=>40)
);
function getRand($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, $proSum);
if ($randNum <= $proCur) {
$result = $key;
break;
} else {
$proSum -= $proCur;
}
}
unset ($proArr);
return $result;
}
foreach ($prize_arr as $key => $val) {
$arr[$val['id']] = $val['v'];
}
$rid = getRand($arr); //根据概率获取奖项id
$res = $prize_arr[$rid-1]; //中奖项
$min = $res['min'];
$max = $res['max'];
$result['angle'] = mt_rand($min,$max); //随机生成一个角度
$result['prize'] = $res['prize'];
echo json_encode($result);
?>
