获取带有子元素的数组元素，而无需在PHP中重复

Question

我带着一些犹豫走来走去，我已经传递了一个带有子元素的数组(可以这么说)，我需要三个随机值，但这些值是在没有重复的情况下获得的。

数组如下:

<>之前数组（[0] =>数组（[uid] => 1[ticket_code] => 0oreb8yo）[1] =>数组（[uid] => 1[ticket_code] => 20eii8hm）[2] =>数组（[uid] => 1[ticket_code] => m0dwtjiw）[3] =>阵列（[uid] => 1[ticket_code] => q6c7cymb）[4] =>数组（[uid] => 1[ticket_code] => zyqhm5bj）[5] =>数组（[uid] => 1[ticket_code] => amdqzjpi）[6] =>数组（[uid] => 2[ticket_code] => tzql7l42）[7] =>数组（[uid] => 2[ticket_code] => gap0r6vf）[8] =>数组（[uid] => 2[ticket_code] => ypqum5yz）[9] =>数组（[uid] => 4[ticket_code] => smupluac）[10] =>数组（[uid] => 4[ticket_code] => 9d8jsha7）[11] =>数组（[uid] => 5[ticket_code] => 6hdnja42））之前

我需要你得到3个"ticket_code"，但没有权利重复"uid"。

我一直在尝试如下，但也重复"uid"。

$ticketsWinners = array();
  for ($i=0; $i < 3; $i++) {
    $aux = array_rand($allTickets);
    $aux2 = $allTickets[$aux]['uid'];
    $ticketsWinners[] = array(
      'uid' => $aux2,
      'ticket_code' => $allTickets[$aux]['ticket_code']
    );
  }

有办法不重复做吗?

如果有人知道什么，我们提前感谢你^^

Answer 1

试试这样写:

$ticketsWinners = array();
while (sizeof($ticketsWinners) < 3) {
    $aux = array_rand($allTickets);
    // array_rand return array of keys so you need first value only
    $uid = $allTickets[$aux[0]]['uid']
    // add uid as a key so ass not tot check all $allTickets values
    if (!isset($ticketsWinners[$uid]))
        $ticketsWinners[$uid] = $allTickets[$aux[0]]; 
}
// if you need $allTickets back to numeric keys [0, 1, 2]
$allTickets = array_values($allTickets);

如果你害怕无限循环(这真的可能发生)，那么试试这个:

$ticketsWinners = array();
// shuffle array before checking
shuffle($allTickets);
foreach ($allTickets as $tick_data) {
    $uid = $tick_data['uid'];
    if (!isset($ticketsWinners[$uid]))
        $ticketsWinners[$uid] = $tick_data;
    if (sizeof($ticketsWinners) == 3)
        break;
}

在最坏的情况下，您检查$allTickets数组并获得大小为<= 3的获胜者

Answer 2

试试这个:

$ticketsWinners = array();
$ticketUid = array();
for ($i=0; $i < 3; $i++) {
    $aux = array_rand($allTickets);
    $aux2 = $allTickets[$aux]['uid'];
    if(! in_array($aux2, $ticketUid)) {
        $ticketUid[$i] = $aux2;
        $ticketsWinners[] = array(
          'uid' => $aux2,
          'ticket_code' => $allTickets[$aux]['ticket_code']
        );
    } else {
        $i--;
    }
}

Answer 3

这种结构会更好(增加了票号唯一的好处)

$tickets = Array
    (
    '0oreb8yo' => 1,              
    '2oeii8hm' => 1,
    'm0dwtjiw' => 1,
    'q6c7cymb' => 1,
     'zyqhm5bj' => 1,
    'amdqzjpi' => 1,
    'tzql7l42' => 2,
    'gap0r6vf' => 2,
    'ypqum5yz' => 2,
    'smupluac' => 3,
    '9d8jsha7' => 4,
    '6hdnja42' => 5,
    );
        $winners = array();
        $picks = 3;
        for($i = 0; $i < $picks; $i++){
if(count($tickets) == 0 ){
break; //or error -- shouldn't need this unless picks exceed uids
}
            $ticket = array_rand($tickets);
            $winner = $tickets[$ticket];
            $winners[] = $winner;
            $tickets = array_filter($tickets, function($item) use ($winner){
                return $winner != $item;
            });
        }
        echo '<pre>';
        var_export($winners);

输出

array (
  0 => 2,
  1 => 1,
  2 => 4,
)
array (
  0 => 2,
  1 => 1,
  2 => 3,
)
array (
  0 => 1,
  1 => 3,
  2 => 2,
)

与while选项不同，这将通过减少票证数组的uid来减少for循环的每个循环的操作。这也是确保你不会总是抽到有彩票的用户的唯一方法，如果用户1买了90%的彩票，你会在他身上循环90%的时间，在任何情况下，你必须减少赢家的彩票数组如果他们只能赢一次。实际上，当每个uid获胜时，您将从列表中删除它们。您还可以确保每张彩票都有相同的获胜机会(也就是说，array_rand是随机的)—它们都具有相同的基础。

票证数组缩减后loop1

array (
  'tzql7l42' => 2,
  'gap0r6vf' => 2,
  'ypqum5yz' => 2,
  'smupluac' => 3,
  '9d8jsha7' => 4,
  '6hdnja42' => 5,
)

loop2后

array (
  'smupluac' => 3,
  '9d8jsha7' => 4,
  '6hdnja42' => 5,
)

loop3后

array (
  'smupluac' => 3,
  '6hdnja42' => 5,
)

赢家

array (
  0 => 1,
  1 => 2,
  2 => 4,
)

返回uid和中奖票更改

$winners[] = $winner;

$winners[$ticket] = $tickets[$ticket];

现在赢家将是，就像输入数组

一样

ticketnumber => uid

ticket是键(也就是彩票)，winner是值(也就是uid)