function get_rand($proArr) {
   $result = '';
 
   //概率數(shù)組的總概率精度
   $proSum = array_sum($proArr);
 
   //概率數(shù)組循環(huán)
   foreach ($proArr as $key => $proCur) {
     $randNum = mt_rand(1, $proSum);
 if ($randNum <= $proCur) {
   $result = $key;
   break;
 } else {
   $proSum -= $proCur;
 }
}
unset ($proArr);
return $result;
}


$prize_arr = array(
'0' => array('id'=>1,'prize'=>'平板電腦','v'=>0.1),
'1' => array('id'=>2,'prize'=>'數(shù)碼相機','v'=>5),
'2' => array('id'=>3,'prize'=>'音箱設備','v'=>10),
'3' => array('id'=>4,'prize'=>'4G優(yōu)盤','v'=>12),
'4' => array('id'=>5,'prize'=>'10Q幣','v'=>22),
'5' => array('id'=>6,'prize'=>'下次沒準就能中哦','v'=>50),
);


foreach ($prize_arr as $key => $val) {
$arr[$val['id']] = $val['v'];
}
$rid = get_rand($arr); //根據(jù)概率獲取獎項id
$res['yes'] = $prize_arr[$rid-1]['prize']; //中獎項
unset($prize_arr[$rid-1]); //將中獎項從數(shù)組中剔除，剩下未中獎項
shuffle($prize_arr); //打亂數(shù)組順序
for($i=0;$i<count($prize_arr);$i++){
$pr[] = $prize_arr[$i]['prize'];
}
$res['no'] = $pr;
echo json_encode($res,JSON_UNESCAPED_UNICODE);