<?php
header("Content-Type: text/html; charset=UTF-8");
function dump($arr){
echo '<pre>'.print_r($arr,TRUE).'</pre>';
}
/*概率算法
proArr array(100,200,300,400)
*/
function get_rand($proArr) {
$result = '';
$proSum = array_sum($proArr);
foreach ($proArr as $key => $proCur) {
$randNum = mt_rand(1, $proSum);
if ($randNum <= $proCur) {
$result = $key;
break;
} else {
$proSum -= $proCur;
}
}
unset ($proArr);
return $result;
}
/*
获取中奖
*/
function get_prize(){
$prize_arr = array(
array('id'=>1,'prize'=>'平板电脑','v'=>1),
array('id'=>2,'prize'=>'数码相机','v'=>1),
array('id'=>3,'prize'=>'音箱设备','v'=>1),
array('id'=>4,'prize'=>'4G优盘','v'=>1),
array('id'=>5,'prize'=>'10Q币','v'=>1),
array('id'=>6,'prize'=>'下次没准就能中哦','v'=>95),
);
foreach ($prize_arr as $key => $val) {
$arr[$val['id']] = $val['v'];
}
$ridk = get_rand($arr); //根据概率获取奖项id
$res['yes'] = $prize_arr[$ridk-1]['prize']; //中奖项
unset($prize_arr[$ridk-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'];
}
$res['no'] = $pr;
return $res;
}
dump(get_prize());
博客园参考文章
github参考源码