<?php//计算中奖概率function getRand($proArr){ ????$rs = ‘‘;//中奖结果 ????$proSum = array_sum($proArr);//概率数组的总概率精度 ????//概率数组循环 ????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‘ => ‘联系笔记本‘, ‘v‘ => 10), ????‘2‘ => array(‘id‘ => 30, ‘title‘ => ‘音箱设备‘, ‘v‘ => 20), ????‘3‘ => array(‘id‘ => 40, ‘title‘ => ‘30GU盘‘, ‘v‘ => 30), ????‘4‘ => array(‘id‘ => 50, ‘title‘ => ‘话费50元‘, ‘v‘ => 10), ????‘5‘ => array(‘id‘ => 60, ‘title‘ => ‘iphone6s‘, ‘v‘ => 15), ????‘6‘ => array(‘id‘ => 70, ‘title‘ => ‘谢谢，继续加油哦！~‘, ‘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); //根据概率获取奖品id //$data[‘msg‘] = ($prize_id == 7) ? 0 : 1; //如果为0则没中 ?echo $data[‘prize_title‘] = $prize_arr[$prize_id - 1][‘title‘]; //中奖奖品 //echo json_encode($data);//以json数组返回给前端exit();PHP随机按百分比抽奖
原文地址：http://blog.51cto.com/xuqin/2119682