header('content-type: text/html;charset=utf-8');
date_default_timezone_set('prc');
//如果上面兩行不存在對(duì)應(yīng)問題，可以不設(shè)置

/**
 * 保存轉(zhuǎn)盤信息及提前設(shè)定的中獎(jiǎng)?wù)哂脩? */
$prize_arr = array(
    array('min'=>1, 'max'=>89, 'prize'=>'一等獎(jiǎng)', 'v'=>25, 'preuser'=>array(51)),
    array('min'=>90, 'max'=>179, 'prize'=>'二等獎(jiǎng)', 'v'=>25),
    array('min'=>180, 'max'=>360, 'prize'=>'三等獎(jiǎng)', 'v'=>50)
);

/**
 * 根據(jù)中獎(jiǎng)?wù)急全@得對(duì)應(yīng)的項(xiàng)
 * @param $prizeinfo array 轉(zhuǎn)盤信息
 * @param $curruser int 當(dāng)前玩轉(zhuǎn)盤用戶id
 * @return int 返回中獎(jiǎng)項(xiàng)
 */
function getRand($prizeinfo, $curruser = 0)
{
     //根據(jù)prize_arr信息，對(duì)應(yīng)key和中獎(jiǎng)?wù)急?    foreach ($prizeinfo as $key=>$val){
        $proArr[$key] = $val['v'];
    }
    $res = '';
    $proSum = array_sum($proArr);
    foreach ($prizeinfo as $key => $cur) { //預(yù)定

        if(!empty($cur['preuser']) && in_array($curruser, $cur['preuser'])){
            return $key;
        }
    }
    foreach ($proArr as $key => $proCur) {//未預(yù)定
        $randNum = mt_rand(1, $proSum);
        if($randNum <= $proCur){ //倘若本次隨機(jī)數(shù)落在占比范圍內(nèi)則表示已經(jīng)中獎(jiǎng)
            $res = $key;
        }else{
            $proSum -= $proCur;
        }
    }
    unset($proArr);
    return $res;
}
$res = getRand($prize_arr); //根據(jù)轉(zhuǎn)盤信息獲得對(duì)應(yīng)獎(jiǎng)項(xiàng)
$reward = $prize_arr[$res]; //中獎(jiǎng)的對(duì)應(yīng)轉(zhuǎn)盤信息
$return = array(
    'angle' => mt_rand($reward['min'], $reward['max']),
    'prize' => $reward['prize'],
    'time' => date('Y-m-d H:i:s')
);

var_dump($return);