PHP隨機按百分比抽獎
阿新 • • 發佈:2018-05-24
PHP概率抽獎
<?php //計算中獎概率 function getRand($proArr){ $rs = ‘‘;//中獎結果 $proSum = array_sum($proArr);//概率數組的總概率精度 //概率數組循環 foreach ($proArr as $key => $proCur) { $randNum = mt_rand(1, $proSum); if ($randNum <= $proCur) { $rs = $key; break; } else { $proSum -= $proCur; } } unset($proArr); return $rs; } $prize_arr = array( ‘0‘ => array(‘id‘ => 10, ‘title‘ => ‘iphone5s‘, ‘v‘ => 5), ‘1‘ => array(‘id‘ => 20, ‘title‘ => ‘聯系筆記本‘, ‘v‘ => 10), ‘2‘ => array(‘id‘ => 30, ‘title‘ => ‘音箱設備‘, ‘v‘ => 20), ‘3‘ => array(‘id‘ => 40, ‘title‘ => ‘30GU盤‘, ‘v‘ => 30), ‘4‘ => array(‘id‘ => 50, ‘title‘ => ‘話費50元‘, ‘v‘ => 10), ‘5‘ => array(‘id‘ => 60, ‘title‘ => ‘iphone6s‘, ‘v‘ => 15), ‘6‘ => array(‘id‘ => 70, ‘title‘ => ‘謝謝,繼續加油哦!~‘, ‘v‘ => 10), ); $arr=array(); foreach ($prize_arr as $key => $val) { $arr[$key+1] = $val[‘v‘]; } echo ‘<pre />‘; print_r($prize_arr); print_r($arr); //exit(); echo $prize_id = getRand($arr); //根據概率獲取獎品id //$data[‘msg‘] = ($prize_id == 7) ? 0 : 1; //如果為0則沒中 echo $data[‘prize_title‘] = $prize_arr[$prize_id - 1][‘title‘]; //中獎獎品 //echo json_encode($data);//以json數組返回給前端 exit();
PHP隨機按百分比抽獎