This article introduces you to the PHP language to implement the big carousel lottery algorithm through specific examples. I hope it will help everyone learn PHP lottery Helps.
1. Assemble the award array;
2. Calculate the probability;
3 .Return the winning status.
The code is as follows: The winning probability 'v' can be set in the background and passed to this method. Pay attention to passing integers
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]['prize']; //未中奖项数组 } $res['no'] = $pr; // var_dump($res); if($res['yes']!='空奖'){ $result['status']=1; $result['name']=$res['yes']; }else{ $result['status']=-1; $result['msg']=$res['yes']; } //return $result; var_dump($result); } //计算中奖概率 function get_rand($proArr) { $result = ''; //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; }
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