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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