Home  >  Article  >  Backend Development  >  Case Analysis of Implementing Roulette Lottery Algorithm Using PHP

Case Analysis of Implementing Roulette Lottery Algorithm Using PHP

php中世界最好的语言
php中世界最好的语言Original
2018-05-16 11:49:403137browse

This time I will bring you a case analysis of using PHP to implement the carousel lottery algorithm. What are the precautions for using PHP to implement the carousel lottery algorithm. The following is a practical case, let's take a look.

Process:

1.Assemble the awardArray

2.Calculate the probability

3.Return The winning situation

The code is as follows:

The winning probability ' v ' can be set in the background and passed to this method, NotePassing Integer

function get_gift(){ 
    //拼装奖项数组 
    // 奖项id,奖品,概率
    $prize_arr = array(  
     '0' => array('id'=>1,'prize'=>'平板电脑','v'=>0),  
     '1' => array('id'=>2,'prize'=>'数码相机','v'=>0),  
     '2' => array('id'=>3,'prize'=>'音箱设备','v'=>0),  
     '3' => array('id'=>4,'prize'=>'4G优盘','v'=>5),  
     '4' => array('id'=>5,'prize'=>'10Q币','v'=>0),  
     '5' => array('id'=>6,'prize'=>'空奖','v'=>5),  
    );  
    foreach ($prize_arr as $key => $val) {  
     $arr[$val['id']] = $val['v'];//概率数组  
    }  
    $rid = $this->get_rand($arr); //根据概率获取奖项id  
    $res['yes'] = $prize_arr[$rid-1]['prize']; //中奖项  
    unset($prize_arr[$rid-1]); //将中奖项从数组中剔除,剩下未中奖项  
    shuffle($prize_arr); //打乱数组顺序  
    for($i=0;$i<count($prize_arr);$i++){  
     $pr[] = $prize_arr[$i][&#39;prize&#39;]; //未中奖项数组 
    }  
    $res[&#39;no&#39;] = $pr; 
    // var_dump($res);
     
    if($res[&#39;yes&#39;]!=&#39;空奖&#39;){ 
      $result[&#39;status&#39;]=1; 
      $result[&#39;name&#39;]=$res[&#39;yes&#39;]; 
    }else{ 
      $result[&#39;status&#39;]=-1; 
      $result[&#39;msg&#39;]=$res[&#39;yes&#39;]; 
    }  
    //return $result; 
    var_dump($result);
  } 
  //计算中奖概率
  function get_rand($proArr) {  
   $result = &#39;&#39;;  
   //概率数组的总概率精度  
   $proSum = array_sum($proArr);  
   // var_dump($proSum);
   //概率数组循环  
   foreach ($proArr as $key => $proCur) {  
    $randNum = mt_rand(1, $proSum); //返回随机整数 
    if ($randNum <= $proCur) {  
     $result = $key;  
     break;  
    } else {  
     $proSum -= $proCur;  
    }  
   }  
   unset ($proArr);  
   return $result;  
  }

Rendering:

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to php Chinese Other related articles online!

Recommended reading:

Detailed explanation of the steps for PHP to use file_get_contents to send http requests

PHP generated QR code poster case analysis

The above is the detailed content of Case Analysis of Implementing Roulette Lottery Algorithm Using PHP. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn