<?php    header("content-type:text/html;charset=utf-8");    function getv($k,$arr){        for($j=$k;$j>=0;$j--){            if($j==0){                $tmp[‘b‘]=intval(0);                $tmp[‘e‘]=intval($arr[$j][‘v‘]);                return $tmp;            }else{                $tmp[‘b‘]=intval($arr[$j-1][‘e‘]);                $tmp[‘e‘]=intval($arr[$j-1][‘e‘]+$arr[$j][‘v‘]);                return $tmp;            }        }    }            function dorand(){        //奖品        $prize_arr = array(            ‘0‘ => array(‘id‘=>1,‘prize‘=>‘平板电脑‘,‘v‘=>3),            ‘1‘ => array(‘id‘=>2,‘prize‘=>‘数码相机‘,‘v‘=>5),            ‘2‘ => array(‘id‘=>3,‘prize‘=>‘音箱设备‘,‘v‘=>10),            ‘3‘ => array(‘id‘=>4,‘prize‘=>‘4G优盘‘,‘v‘=>12),            ‘4‘ => array(‘id‘=>5,‘prize‘=>‘Q币10元‘,‘v‘=>20),            ‘5‘ => array(‘id‘=>6,‘prize‘=>‘下次没准就能中哦‘,‘v‘=>50),        );        //计算概率范围        for($i=0;$i<count($prize_arr);$i++){            $tmp = getv($i,$prize_arr);            $prize_arr[$i][‘b‘] = $tmp[‘b‘];            $prize_arr[$i][‘e‘] = $tmp[‘e‘];        }                //获取概率        foreach ($prize_arr as $key => $val) {            $arr[$val[‘id‘]][‘v‘] = $val[‘v‘];            $arr[$val[‘id‘]][‘b‘] = $val[‘b‘];            $arr[$val[‘id‘]][‘e‘] = $val[‘e‘];            $arr[$val[‘id‘]][‘prize‘] = $val[‘prize‘];            //获取概率总和            $sum +=$arr[$val[‘id‘]][‘v‘];        }        ///产生随机数        $r = mt_rand(1, $sum);        //var_dump($arr);        //遍历数据        foreach($arr as $k=>$v){            //exit;            //判断概率区间            if(($v[‘b‘]<=$r && $v[‘e‘]>=$r)){                echo "随机数:".$r . "\t" . "概率".$v[‘b‘]."--".$v[‘e‘] . "\t"."总概率:".$sum. "\n";                //返回中奖id                $id = $k;                return $prize = $arr[$k][‘prize‘];                break;            }        }    }        for($z=1;$z<=3;$z++){        echo "\r\n第【".$z."】次中奖奖品为：".dorand()."<p>";    }    ?>