search
HomeBackend DevelopmentPHP TutorialPHP lottery algorithm program code for winning probability_PHP tutorial

PHP lottery algorithm program code for winning probability_PHP tutorial

Jul 20, 2016 am 11:16 AM
phpWinningcodelotteryProbabilityofprogramalgorithmmaterialneed

Based on these needs in the initial stage, and then based on the information on the Internet, a staged extraction method was adopted. Let’s take a look at the overall program: This program is completed under the ThinkPHP framework, using some frameworks to automatically I will explain the class libraries and functions provided one by one below, the controller part

The requirements that the lottery algorithm needs to meet are as follows:

1. You can control the probability of winning

2. Randomness

3. It is best to control the number of prizes

4. Limit the number of draws based on user ID or IP, mobile phone number, QQ number and other conditions


Based on these needs in the early stage, and then based on the information on the Internet, a staged extraction method was adopted. Let’s take a look at the overall procedure:

This program is completed under the ThinkPHP framework, using some class libraries and functions that come with the framework. I will explain them one by one below. The controller part:

The code is as follows

/**
*
*
* @lanfengye
​*/
class ChoujiangAction extends Action {
//The start time of the lottery
var $begin_time="2012-12-25 14:00:00"; //Start time 0-no limit
//End time of the lottery
var $stop_time="0"; //End time 0-no limit
         
//The prize information for this lottery must be filled in in order from largest to smallest. id is the award number, prize is the winning information, v is the probability of winning, and num is the number of prizes
//It should be noted that this must also contain information about not winning, and the probability is sorted from small to large
var $prize_arr = array(
'0' => array('id' => 1, 'prize' => 'Purchase 1G/year space for 44 yuan', 'v' => 1,'num'=>1),
'1' => array('id' => 2, 'prize' => 'Purchase 1G/year space for 55 yuan', 'v' => 2, 'num'=>2),
'2' => array('id' => 3, 'prize' => 'Purchase 1G/year space for 66 yuan', 'v' => 5,'num'=>2),
'3' => array('id' => 4, 'prize' => 'Purchase 1G/year space for 77 yuan', 'v' => 10,'num'=>3),
'4' => array('id' => 5, 'prize' => 'Purchase 1G/year space for 88 yuan', 'v' => 15,'num'=>4),
'5' => array('id' => 6, 'prize' => 'Purchase 1G/year space for 99 yuan', 'v' => 67,'num'=>10),
);
       

//How to display the home page
Public function index(){
//Connect to the database to get the list of winners
         $Choujiang=M('Choujiang');
          $this->assign('list', $Choujiang->where("rid>0")->order('id desc')->select());
         unset($Choujiang);
                                                                        ​​​​ //Display the start time of the lottery on the homepage
          $this->assign('begin_time',$this->begin_time);
                                                                        $this->display();
}
         

         
/**
* Generate winning information, use ajax to request this method, and the customer needs to fill in the QQ number
​​*/
Public function make() {
         $qq_no= trim($_POST['qq_no']);
         import('ORG.Util.Input');
         $qq_no=Input::getVar($qq_no);
                                                                        If(empty($qq_no)){
                 $this->ajaxReturn(1, 'Please fill in the QQ number correctly!');
exit;
}
                                                                        If(!empty($this->begin_time) && time()begin_time)){
                   $this->ajaxReturn(1, 'The lottery has not started yet, the starting time is:'.$this->begin_time);
exit;
}
                                                                         If(!empty($this->stop_time) && time()>strtotime($this->stop_time)){
                  $this->ajaxReturn(1, 'This lottery has ended, the end time is:'.$this->stop_time);
exit;
}
                                                                         //Get the award information array, from private members
$prize_arr= $this->prize_arr;
                                                                         foreach ($prize_arr as $key => $val) {
               $arr[$val['id']] = $val['v'];
}
//$rid’s winning serial number
           $rid = $this->get_rand($arr); //Get the award id based on probability
                                                                                   $str = $prize_arr[$rid - 1]['prize']; //Winning prize
                                                                                  $Choujiang=M('Choujiang');
                                                                         //Get the number of times a specific QQ number has participated in the lottery from the database. If it is greater than or equal to 3, the number of prompts has been exhausted
If($Choujiang->where("qq_no='{$qq_no}'")->count()>=3){
               $str='Your 3 lucky draw opportunities have been used up! ';
               $rid=0;
//The number of times to obtain a specific award serial number from the database. If it is greater than or equal to the set maximum number of times, it will prompt that the prize has been drawn. If you need to always win the last commemorative award, just modify this place
            }elseif ($Choujiang->where("rid={$rid}")->count()>=$prize_arr[$rid-1]['num']) {
               $str='Sorry, the prize you have drawn has been exhausted! ';
               $rid=0;
}
                 // Generate a user lottery data for recording to the database
         $data=array(
             'rid'=>$rid,
             'pop'=>$str,
              'qq_no'=>$qq_no,
             'input_time'=>time()
);
//Write the user lottery information array into the database
                                                                                   $Choujiang->add($data);
         unset($Choujiang);
                                                                         //ajax return information
           $this->ajaxReturn(1, $str);
}
         
/**
* Get the winning numbers based on probability
​​*/
Private function get_rand($proArr) {
          $result = '';
//Total probability accuracy of probability array
​​​​ $proSum = array_sum($proArr);
//Probability array loop
foreach ($proArr as $key => $proCur) {
                $randNum = mt_rand(1, $proSum);
                  if ($randNum                     $result = $key;
                 break;
              } else {
                    $proSum -= $proCur;
            }
}
          unset($proArr);
         return $result;
}
         
}



?>

The algorithm is simple to use and has very good concurrent access performance. It can be used in various situations with slight modifications. Combined with user login and other information, it can effectively control the number of draws for each person. By changing the start and end to an array, you can complete the program to draw a lottery at a specific time every day.

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/372543.htmlTechArticleIn the initial stage, these needs were met, and then based on the information on the Internet, a staged extraction method was adopted. You can see below Let’s look at the overall program: This program is completed under the ThinkPHP framework, so...
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
When would you use a trait versus an abstract class or interface in PHP?When would you use a trait versus an abstract class or interface in PHP?Apr 10, 2025 am 09:39 AM

In PHP, trait is suitable for situations where method reuse is required but not suitable for inheritance. 1) Trait allows multiplexing methods in classes to avoid multiple inheritance complexity. 2) When using trait, you need to pay attention to method conflicts, which can be resolved through the alternative and as keywords. 3) Overuse of trait should be avoided and its single responsibility should be maintained to optimize performance and improve code maintainability.

What is a Dependency Injection Container (DIC) and why use one in PHP?What is a Dependency Injection Container (DIC) and why use one in PHP?Apr 10, 2025 am 09:38 AM

Dependency Injection Container (DIC) is a tool that manages and provides object dependencies for use in PHP projects. The main benefits of DIC include: 1. Decoupling, making components independent, and the code is easy to maintain and test; 2. Flexibility, easy to replace or modify dependencies; 3. Testability, convenient for injecting mock objects for unit testing.

Explain the SPL SplFixedArray and its performance characteristics compared to regular PHP arrays.Explain the SPL SplFixedArray and its performance characteristics compared to regular PHP arrays.Apr 10, 2025 am 09:37 AM

SplFixedArray is a fixed-size array in PHP, suitable for scenarios where high performance and low memory usage are required. 1) It needs to specify the size when creating to avoid the overhead caused by dynamic adjustment. 2) Based on C language array, directly operates memory and fast access speed. 3) Suitable for large-scale data processing and memory-sensitive environments, but it needs to be used with caution because its size is fixed.

How does PHP handle file uploads securely?How does PHP handle file uploads securely?Apr 10, 2025 am 09:37 AM

PHP handles file uploads through the $\_FILES variable. The methods to ensure security include: 1. Check upload errors, 2. Verify file type and size, 3. Prevent file overwriting, 4. Move files to a permanent storage location.

What is the Null Coalescing Operator (??) and Null Coalescing Assignment Operator (??=)?What is the Null Coalescing Operator (??) and Null Coalescing Assignment Operator (??=)?Apr 10, 2025 am 09:33 AM

In JavaScript, you can use NullCoalescingOperator(??) and NullCoalescingAssignmentOperator(??=). 1.??Returns the first non-null or non-undefined operand. 2.??= Assign the variable to the value of the right operand, but only if the variable is null or undefined. These operators simplify code logic, improve readability and performance.

What is Content Security Policy (CSP) header and why is it important?What is Content Security Policy (CSP) header and why is it important?Apr 09, 2025 am 12:10 AM

CSP is important because it can prevent XSS attacks and limit resource loading, improving website security. 1.CSP is part of HTTP response headers, limiting malicious behavior through strict policies. 2. The basic usage is to only allow loading resources from the same origin. 3. Advanced usage can set more fine-grained strategies, such as allowing specific domain names to load scripts and styles. 4. Use Content-Security-Policy-Report-Only header to debug and optimize CSP policies.

What are HTTP request methods (GET, POST, PUT, DELETE, etc.) and when should each be used?What are HTTP request methods (GET, POST, PUT, DELETE, etc.) and when should each be used?Apr 09, 2025 am 12:09 AM

HTTP request methods include GET, POST, PUT and DELETE, which are used to obtain, submit, update and delete resources respectively. 1. The GET method is used to obtain resources and is suitable for read operations. 2. The POST method is used to submit data and is often used to create new resources. 3. The PUT method is used to update resources and is suitable for complete updates. 4. The DELETE method is used to delete resources and is suitable for deletion operations.

What is HTTPS and why is it crucial for web applications?What is HTTPS and why is it crucial for web applications?Apr 09, 2025 am 12:08 AM

HTTPS is a protocol that adds a security layer on the basis of HTTP, which mainly protects user privacy and data security through encrypted data. Its working principles include TLS handshake, certificate verification and encrypted communication. When implementing HTTPS, you need to pay attention to certificate management, performance impact and mixed content issues.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use