小雨在线网站自营销研究


    
    

        

        

    
    






-----------data.php----------------------------------
 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);