PHP   发布时间:2022-04-09  发布网站:大佬教程  code.js-code.com
大佬教程收集整理的这篇文章主要介绍了php实现概率性随机抽奖代码大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。

1、初始数据:

权重越大,抽取的几率越高 [奖品1, 权重 5],[ 奖品2, 权重6], [ 奖品3, 权重 7], [ 奖品4, 权重2]

2、处理步骤:

1)N = 5 + 6 + 7 + 2 = 20 2)然后取1-N的随机数M 3)界定各 奖品的权重范围值 奖品 1 : 1-5 ; 奖品2 : 6-11; 奖品3: 12-18; 奖品4: 19-20 4) 如果M在某个奖品的权重范围值内,标识这个奖品被抽取到

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权重范围区间起始值

protected $start = 0;

权重范围区间结束值

protected $end = 0;

public function __construct($id,$weight,$Name) {@H_673_21@ if (!$id) {@H_673_21@ throw new Exception('奖品ID为空.');@H_673_21@ }@H_673_21@ $this->id = $id;@H_673_21@ $this->weight = $weight ? $weight : 0;@H_673_21@ $this->name = $name ? $name : '随机奖品' . $id;@H_673_21@ }

id

public function getId() {@H_673_21@ return $this->id;@H_673_21@ }

权重

public function getWeight() {@H_673_21@ return $this->weight;@H_673_21@ }

设置权重范围区间

public function setRange($start,$end) {@H_673_21@ $this->start = $start;@H_673_21@ $this->end = $end;@H_673_21@ }

判断随机数是否在权重范围区间

public function inRange($num) {@H_673_21@ return ($num >= $this->start) && ($num <= $this->end);@H_673_21@ }@H_673_21@ }

/**

  • 奖品池@H_673_21@ */@H_673_21@ class PrizePoll implements IteratorAggregate,Countable {

    奖品集

    protected $items = array();

加入奖品

public function addItem(Prize $item) {@H_673_21@ $this->items[$item->getId()] = $item;@H_673_21@ return $this;@H_673_21@ }

删除奖品

public function removeItem($itemId) {@H_673_21@ if (isset($this->items[$itemId])) {@H_673_21@ unset($this->items[$itemId]);@H_673_21@ }@H_673_21@ return $this;@H_673_21@ }

更新奖品

public function updateItem(Prize $item) {@H_673_21@ if (isset($this->items[$item->getId()])) {@H_673_21@ $this->items[$item->getId()] = $item;@H_673_21@ }@H_673_21@ return $this;@H_673_21@ }

获取所有奖品

public function getItems() {@H_673_21@ return $this->items;@H_673_21@ }

所有所有可用奖品(如果权重为0,说明这个奖品永远不可能抽到)

public function getVisibleItems() {@H_673_21@ $items = array();@H_673_21@ foreach ($this->items as $item) {@H_673_21@ if ($item->getWeight()) {@H_673_21@ $items[$item->getId()] = $item;@H_673_21@ }@H_673_21@ }@H_673_21@ return $items;@H_673_21@ }

Countable::count

public function count() {@H_673_21@ return count($this->items);@H_673_21@ }

IteratorAggregate::getIterator()

public function getIterator() {@H_673_21@ return new ArrayIterator($this->items);@H_673_21@ }@H_673_21@ }

/**

  • 简单的抽奖类@H_673_21@ */@H_673_21@ class SimpleTurn {

    奖池

    protected $poll = null;

public function __construct(PrizePoll $poll) {@H_673_21@ if ($poll) {@H_673_21@ $this->setPoll($poll);@H_673_21@ }@H_673_21@ }

抽奖

public function run(PrizePoll $poll) {@H_673_21@ $poll = $poll ? $poll : $this->poll;@H_673_21@ if ( ! $poll) {@H_673_21@ throw new Exception('奖池未初始化');@H_673_21@ }

if ($poll->count() <= 0) {
  throw new Exception('奖池为空');
}

$items = $poll->getVisibleItems();
if (count($items) <= 0) {
  throw new Exception('奖池为空');
}

$sum = 0;
foreach ($items as $item) {
  $start = $sum + 1;
  $sum += $item->getWeight();
  $end = $sum;

  # 设置奖品的权重范围区间
  $item->setRange(<a href="http://code.js-code.com/tag/start/" target="_blank" class="keywords">$start</a>,$end);
}

# <a href="http://code.js-code.com/tag/suiji/" target="_blank" class="keywords">随机</a>数
$rand = $this->getRandNum(1,$sum);

# 区间段判断
foreach ($items as $item) {
  if ($item->inRange($rand)) {
    return $item;
  }
}
return null;

}

获取随机

public function getRandNum($min,$maX) {@H_673_21@ return mt_rand($min ? $min : 1,$maX);@H_673_21@ }

设置奖池

public function setPoll(PrizePoll $poll) {@H_673_21@ $this->poll = $poll;@H_673_21@ }@H_673_21@ }

示例

try {@H_673_21@ $prizePoll = new PrizePoll();@H_673_21@ $prizePoll->addItem(new Prize(1,5))@H_673_21@ ->addItem(new Prize(2,6))@H_673_21@ ->addItem(new Prize(3,7))@H_673_21@ ->addItem(new Prize(4,2));

$turn = new SimpleTurn($prizePoll);@H_673_21@ $prize = $turn->run();@H_673_21@ var_dump($prizE);@H_673_21@ } catch (Exception $E) {@H_673_21@ print_r($E);@H_673_21@ }

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