header('content-type: text/html;charset=utf-8');
date_default_timezone_set('prc');
//如果上面两行不存在对应问题，可以不设置

/**
 * 保存转盘信息及提前设定的中奖者用户
 */
$prize_arr = array(
    array('min'=>1, 'max'=>89, 'prize'=>'一等奖', 'v'=>25, 'preuser'=>array(51)),
    array('min'=>90, 'max'=>179, 'prize'=>'二等奖', 'v'=>25),
    array('min'=>180, 'max'=>360, 'prize'=>'三等奖', 'v'=>50)
);

/**
 * 根据中奖占比获得对应的项
 * @param $prizeinfo array 转盘信息
 * @param $curruser int 当前玩转盘用户id
 * @return int 返回中奖项
 */
function getRand($prizeinfo, $curruser = 0)
{
     //根据prize_arr信息，对应key和中奖占比
    foreach ($prizeinfo as $key=>$val){
        $proArr[$key] = $val['v'];
    }
    $res = '';
    $proSum = array_sum($proArr);
    foreach ($prizeinfo as $key => $cur) { //预定

        if(!empty($cur['preuser']) && in_array($curruser, $cur['preuser'])){
            return $key;
        }
    }
    foreach ($proArr as $key => $proCur) {//未预定
        $randNum = mt_rand(1, $proSum);
        if($randNum <= $proCur){ //倘若本次随机数落在占比范围内则表示已经中奖
            $res = $key;
        }else{
            $proSum -= $proCur;
        }
    }
    unset($proArr);
    return $res;
}
$res = getRand($prize_arr); //根据转盘信息获得对应奖项
$reward = $prize_arr[$res]; //中奖的对应转盘信息
$return = array(
    'angle' => mt_rand($reward['min'], $reward['max']),
    'prize' => $reward['prize'],
    'time' => date('Y-m-d H:i:s')
);

var_dump($return);