<?php namespace redpacket; /** * @Author: renakeji * @Date: 2018-04-02 16:52:26 * @Last Modified by: renakeji * @Last Modified time: 2018-04-02 16:52:36 */ class OptionDTO {/*{{{*/ //红包总金额 public $totalMoney; //红包数量 public $num; //范围开始 public $rangeStart; //范围结算 public $rangeEnd; //生成红包策略 public $builderStrategy; //随机红包剩余规则 public $randFormatType; //Can_Left:不修数据,可以有剩余;No_Left:不能有剩余 public static function create($totalMoney,$num,$rangeStart,$rangEnd, $builderStrategy,$randFormatType = 'No_Left') {/*{{{*/ $self = new self(); $self->num = $num; $self->rangeStart = $rangeStart; $self->rangeEnd = $rangEnd; $self->totalMoney = $totalMoney; $self->builderStrategy = $builderStrategy; $self->randFormatType = $randFormatType; return $self; }/*}}}*/ }
<?php namespace redpacket; /** * @Author: renakeji * @Date: 2018-04-02 15:43:25 * @Last Modified by: renakeji * @Last Modified time: 2018-04-02 16:42:26 */ //固定等额红包策略 class EqualPackageStrategy {/*{{{*/ //单个红包金额 public $oneMoney; //数量 public $num; public function __construct($option = null) { $this->setOption($option); } public function setOption(OptionDTO $option) { $this->oneMoney = $option->rangeStart; $this->num = $option->num; } public function create() {/*{{{*/ $data = array(); if(false == $this->isCanBuilder()) { return $data; } $data = array(); if(false == is_int($this->num) || $this->num <= 0) { return $data; } for($i = 1;$i <= $this->num;$i++) { $data[$i] = $this->fx($i); } return $data; }/*}}}*/ /** * 等额红包的方程是一条直线 * * @param mixed $x * @access public * @return void */ public function fx($x) {/*{{{*/ return $this->oneMoney; }/*}}}*/ /** * 是否能固定红包 * * @access public * @return void */ public function isCanBuilder() {/*{{{*/ if(false == is_int($this->num) || $this->num <= 0) { return false; } if(false == is_numeric($this->oneMoney) || $this->oneMoney <= 0) { return false; } //单个红包小于1分 if($this->oneMoney < 0.01) { return false; } return true; }/*}}}*/ }/*}}}*/
<?php namespace redpacket; //随机红包策略(三角形) class RandTrianglePackageStrategy { //总额 public $totalMoney; //红包数量 public $num; //随机红包最小值 public $minMoney; //随机红包最大值 public $maxMoney; //修数据方式:NO_LEFT: 红包总额 = 预算总额;CAN_LEFT: 红包总额 <= 预算总额 public $formatType; //预算剩余金额 public $leftMoney; public function __construct($option = null) { $this->setOption($option); } public function setOption($option) { $this->totalMoney = $option->totalMoney; $this->num = $option->num; $this->formatType = $option->randFormatType; $this->minMoney = $option->rangeStart; $this->maxMoney = $option->rangeEnd; $this->leftMoney = $this->totalMoney; } /** * 创建随机红包 * * @access public * @return void */ public function create() { $data = array(); if(false == $this->isCanBuilder()) { return $data; } $leftMoney = $this->leftMoney; for($i = 1;$i <= $this->num;$i++) { $data[$i] = $this->fx($i); $leftMoney = $leftMoney - $data[$i]; } //修数据 list($okLeftMoney,$okData) = $this->format($leftMoney,$data); //随机排序 shuffle($okData); $this->leftMoney = $okLeftMoney; return $okData; } /** * 是否能够发随机红包 * * @access public * @return void */ public function isCanBuilder() { if(false == is_int($this->num) || $this->num <= 0) { return false; } if(false == is_numeric($this->totalMoney) || $this->totalMoney <= 0) { return false; } //均值 $avgMoney = $this->totalMoney / 1.0 / $this->num; //均值小于最小值 if($avgMoney < $this->minMoney ) { return false; } return true; } /** * 获取剩余金额 * * @access public * @return void */ public function getLeftMoney() { return $this->leftMoney; } /** * 随机红包生成函数。三角函数。[(1,0.01),($num/2,$avgMoney),($num,0.01)] * * @param mixed $x,1 <= $x <= $this->num; * @access public * @return void */ public function fx($x) { if(false == $this->isCanBuilder()) { return 0; } if($x < 1 || $x > $this->num) { return 0; } $x1 = 1; $y1 = $this->minMoney; //我的峰值 $y2 = $this->maxMoney; //中间点 $x2 = ceil($this->num / 1.0 / 2); //最后点 $x3 = $this->num; $y3 = $this->minMoney; //当x1,x2,x3都是1的时候(竖线) if($x1 == $x2 && $x2 == $x3) { return $y2; } // '/_\'三角形状的线性方程 //'/'部分 if($x1 != $x2 && $x >= $x1 && $x <= $x2) { $y = 1.0 * ($x - $x1) / ($x2 - $x1) * ($y2 - $y1) + $y1; return number_format($y, 2, '.', ''); } //'\'形状 if($x2 != $x3 && $x >= $x2 && $x <= $x3) { $y = 1.0 * ($x - $x2) / ($x3 - $x2) * ($y3 - $y2) + $y2; return number_format($y, 2, '.', ''); } return 0; } /** * 格式化修红包数据 * * @param mixed $leftMoney * @param array $data * @access public * @return void */ private function format($leftMoney,array $data) { //不能发随机红包 if(false == $this->isCanBuilder()) { return array($leftMoney,$data); } //红包剩余是0 if(0 == $leftMoney) { return array($leftMoney,$data); } //数组为空 if(count($data) < 1) { return array($leftMoney,$data); } //如果是可以有剩余,并且$leftMoney > 0 if('Can_Left' == $this->formatType && $leftMoney > 0) { return array($leftMoney,$data); } //我的峰值 $myMax = $this->maxMoney; // 如果还有余钱,则尝试加到小红包里,如果加不进去,则尝试下一个。 while($leftMoney > 0) { $found = 0; foreach($data as $key => $val) { //减少循环优化 if($leftMoney <= 0) { break; } //预判 $afterLeftMoney = (double)$leftMoney - 0.01; $afterVal = (double)$val + 0.01; if( $afterLeftMoney >= 0 && $afterVal <= $myMax) { $found = 1; $data[$key] = number_format($afterVal,2,'.',''); $leftMoney = $afterLeftMoney; //精度 $leftMoney = number_format($leftMoney,2,'.',''); } } //如果没有可以加的红包,需要结束,否则死循环 if($found == 0) { break; } } //如果$leftMoney < 0 ,说明生成的红包超过预算了,需要减少部分红包金额 while($leftMoney < 0) { $found = 0; foreach($data as $key => $val) { if($leftMoney >= 0) { break; } //预判 $afterLeftMoney = (double)$leftMoney + 0.01; $afterVal = (double)$val - 0.01; if( $afterLeftMoney <= 0 && $afterVal >= $this->minMoney) { $found = 1; $data[$key] = number_format($afterVal,2,'.',''); $leftMoney = $afterLeftMoney; $leftMoney = number_format($leftMoney,2,'.',''); } } //如果一个减少的红包都没有的话,需要结束,否则死循环 if($found == 0) { break; } } return array($leftMoney,$data); } }
<?php namespace redpacket; use redpacket\OptionDTO; use redpacket\EqualPackageStrategy; use redpacket\RandTrianglePackageStrategy; /** * 随机红包+固定红包算法[策略模式] */ class redpacket {/*{{{*/ public static function equal($money,$num,$start,$end) { //固定红包 $dto = OptionDTO::create($money,$num,$start,$end); $EqualPackageStrategy = new EqualPackageStrategy($dto); $data = $EqualPackageStrategy->create(); return $data; } public static function rand($money,$num,$start,$end) { //随机红包[修数据] $dto = OptionDTO::create($money,$num,$start,$end,'NO_LEFT'); $RandTrianglePackageStrategy = new RandTrianglePackageStrategy($dto); $data = $RandTrianglePackageStrategy->create(); return $data; } public static function randcanleft($money,$num,$start,$end) { //随机红包[不修数据] $dto = OptionDTO::create($money,$num,$start,$end,'Can_Left'); $RandTrianglePackageStrategy = new RandTrianglePackageStrategy($dto); $data = $RandTrianglePackageStrategy->create(); return $data; } }
本文为看恩吧原创文章,转载无需和我联系,但请注明来自knsay.com