php隨機抽獎實例分析

2024-05-04 23:31:52

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這篇文章主要介紹了php隨機抽獎實現方法,實例分析了php抽獎類lottery_tool及其具體使用技巧,需要的朋友可以參考下

本文實例講述了php隨機抽獎用法。分享給大家供大家參考。具體分析如下：

1. 按照設定的概率，得到隨機抽獎的結果。

復制代碼代碼如下:

		<?php 
		/**
		 * 抽獎工具
		 */
		class lottery_tool {
		    protected static $awardsArr;
		    protected static $proField = 'probability';
		    protected static $proSum = 0;
		    protected static $checkAward = false;
		    const SUCCESS_CODE = 0;
		    const FAIL_CODE = -1;
		    //檢查抽獎數據
		    protected static function checkAwards(){
		        if (!is_array(self::$awardsArr) || empty(self::$awardsArr)) {
		            return self::$checkAward = false;
		        }
		        self::$proSum = 0;
		        foreach (self::$awardsArr as $_key => $award) {
		            self::$proSum += $award[self::$proField];
		        }
		        if (empty(self::$proSum)) {
		            return self::$checkAward = false;
		        }
		        return self::$checkAward = true;
		    }
		    protected static function successRoll($rollKey){
		        return array('code' => self::SUCCESS_CODE, 'roll_key' => $rollKey, 'msg' => 'roll success');
		    }
		    protected static function failRoll($msg = 'roll fail'){
		        return array('code' => self::FAIL_CODE, 'msg' => $msg );
		    }
		    //抽獎
		    public static function roll () {
		        if (false == self::$checkAward) {
		            return self::failRoll('awards data is not the right format!');
		        }
		        $result = mt_rand(0, self::$proSum);
		        $proValue = 0;
		        foreach (self::$awardsArr as $_key => $value) {
		            $proValue += $value[self::$proField]; 
		            if ($result <= $proValue) {
		                return self::successRoll($_key);
		            }
		        }
		        return self::failRoll('wrong');
		    } 
		    //改變概率字段名
		    public static function setProField($field = null) {
		        if (!empty($field)) {
		            self::$proField = $field;
		        }
		    }
		    //設置獎品
		    public static function setAwards($awards){
		        self::$awardsArr = $awards;
		        self::checkAwards();
		    }
		}

2. 示例代碼：

復制代碼代碼如下:

		$awards = array(
		    '0' => array('pro' => 15, 'info' => '15%的可能性'),
		    '1' => array('pro' => 25, 'info' => '25%的可能性'),
		    '2' => array('pro' => 40, 'info' => '40%的可能性'),
		    '3' => array('pro' => 20, 'info' => '20%的可能性'),
		    );
		lottery_tool::setProField('pro');
		lottery_tool::setAwards($awards);
		$result = array();
		for ($i = 10000; $i --;) {
		    $result[] = lottery_tool::roll();
		}
		foreach ($result as $key => $value) {
		    $awards[$value['roll_key']]['num'] ++;
		}
		echo '<pre>';
		var_dump($awards);

運行結果如下：

復制代碼代碼如下:

		array
		  0 => 
		    array
		      'pro' => int 15
		      'info' => string '15%的可能性' (length=15)
		      'num' => int 1596
		  1 => 
		    array
		      'pro' => int 25
		      'info' => string '25%的可能性' (length=15)
		      'num' => int 2484
		  2 => 
		    array
		      'pro' => int 40
		      'info' => string '40%的可能性' (length=15)
		      'num' => int 3939
		  3 => 
		    array
		      'pro' => int 20
		      'info' => string '20%的可能性' (length=15)
		      'num' => int 1981