PHP+jQuery实现的大转盘抽奖程序

PHP+jQuery实现的大转盘抽奖程序

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演示地址:

http://www.jincon.com/download/lottery/

抽奖算法部分:

<?php
$prize_arr = array(
    '0' => array('id'=>1,'min'=>1,'max'=>29,'prize'=>'一等奖','v'=>1),
    '1' => array('id'=>2,'min'=>302,'max'=>328,'prize'=>'二等奖','v'=>2),
    '2' => array('id'=>3,'min'=>242,'max'=>268,'prize'=>'三等奖','v'=>5),
    '3' => array('id'=>4,'min'=>182,'max'=>208,'prize'=>'四等奖','v'=>7),
    '4' => array('id'=>5,'min'=>122,'max'=>148,'prize'=>'五等奖','v'=>10),
    '5' => array('id'=>6,'min'=>62,'max'=>88,'prize'=>'六等奖','v'=>25),
    '6' => array('id'=>7,'min'=>array(32,92,152,212,272,332),
    'max'=>array(58,118,178,238,298,358),'prize'=>'七等奖','v'=>50)
);
function getRand($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 = $res['max'];
if($res['id']==7){ //七等奖
$i = mt_rand(0,5);
    $result['angle'] = mt_rand($min[$i],$max[$i]);
}else{
    $result['angle'] = mt_rand($min,$max); //随机生成一个角度
}
$result['prize'] = $res['prize'];

echo json_encode($result);
?>


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