如何检测多维关联数组中的重复值？

Question

我有一个多维关联数组：

Array
(
    [0] => Array
        (
            [customer_name] => John Dow
            [customer_email] => john@example.com
            [customer_mobile] => 1236547895
            [birth_date] => 12/1/1996
            [status] => Enable
        )

    [1] => Array
        (
            [customer_name] => Alex
            [customer_email] => alex@example.com
            [customer_mobile] => 4563214785
            [birth_date] => 19/1/1996
            [status] => Enable
        )

    [2] => Array
        (
            [customer_name] => Arina
            [customer_email] => arina@example.com
            [customer_mobile] => 963214785
            [birth_date] => 25/1/1996
            [status] => Enable
        )

    [3] => Array
        (
            [customer_name] => Atom
            [customer_email] => atom@example.com
            [customer_mobile] => 5214789632
            [birth_date] => 12/1/1998
            [status] => Enable
        )

    [4] => Array
        (
            [customer_name] => Jennifer
            [customer_email] => jennifer@example.com
            [customer_mobile] => 4563214785
            [birth_date] => 12/2/1996
            [status] => Enable
        )
)

现在我想检查 customer_mobile 和 customer_email 中彼此相似的值以减少冗余。联系电话和电子邮件地址不能重复。

所以请指导我，我怎样才能做到这一点？谢谢:)

Answer 1

你可以这样做（我从头生成代码所以它可能有错误 - 但想法应该清楚）（我假设你的数组名称是 $persons）：

$emails = [];
$mobiles = [];

$discard = false;
foreach($persons as $person) 
{
   $email = $person['customer_email'];

   if(!isset($emails[$email])) {
       $emails[$email] = $person;
   } else {
      $emails[$email]['redundant_email']=true;
      $person['redundant_email']=true;
      $discard = true;
   }

   $mobile = $person['customer_mobile'];

   if(!isset($mobiles[$mobile])) {
       $mobiles[$mobile] = $person;
   } else {
       $mobiles[$mobile]['redundant_mobile']=true;
       $person['redundant_mobile']=true;
       $discard = true;
   }
}

因此，每个拥有冗余手机或电子邮件的人都将字段 redundant_email 或 redundant_mobile 设置为 true。变量 $discard=true 表示数组是多余的。

Answer 2

因为你不需要知道哪个，而只需要知道if，你可以使用array_column + array_unique: (run)

$cm = array_column($arr, 'customer_mobile');
if($cm != array_unique($cm)){
    echo 'There are duplicates in customer_mobile';
}

$ce = array_column($arr, 'customer_email');
if($cm != array_unique($ce)){
    echo 'There are duplicates in customer_email';
}

如果您需要同时匹配电子邮件和手机，请在同一个if:

中进行

if($cm != array_unique($cm) && $ce != array_unique($ce)){
    echo 'There are duplicates in both customer_mobile and customer_email';
}

Answer 3

简单的解决方案是：

<?php

$data = [
  [
    'name' => 'name 1',
    'phone' => '12341234',
    'email' => 'test@web.com'
  ],
  [
    'name' => 'name 2',
    'phone' => '12341234',
    'email' => 'test@web1.com'
  ],
  [
    'name' => 'name 3',
    'phone' => '4322342',
    'email' => 'test@web1.com'
  ],
  [
    'name' => 'name 4',
    'phone' => '1234123423',
    'email' => 'test@web1.com'
  ],
  [
    'name' => 'name 5',
    'phone' => '12341266634',
    'email' => 'test@eqweqwweb.com'
  ],
];

$phones = [];
$emails = [];
foreach ($data as $key => $contact) {
  if (array_search($contact['phone'], $phones) !== false || array_search($contact['email'], $emails) !== false) {
    unset($data[$key]);
  } else {
    $phones[] = $contact['phone'];
    $emails[] = $contact['email'];
  }
}

var_dump($data);

结果你会得到：

array(3) {
  [0] =>
  array(3) {
    'name' =>
    string(6) "name 1"
    'phone' =>
    string(8) "12341234"
    'email' =>
    string(12) "test@web.com"
  }
  [2] =>
  array(3) {
    'name' =>
    string(6) "name 3"
    'phone' =>
    string(7) "4322342"
    'email' =>
    string(13) "test@web1.com"
  }
  [4] =>
  array(3) {
    'name' =>
    string(6) "name 5"
    'phone' =>
    string(11) "12341266634"
    'email' =>
    string(18) "test@eqweqwweb.com"
  }
}

这只是示例。

Answer 4

用 foreach 试试这个。只需要遍历数组一次，使用email和mobile作为唯一键，唯一键相同的元素只保留最后一个。如果您希望结果使用数字索引，请在 $result.

上使用 array_values()

$result = [];
foreach($array as $v)
{
  $result[$v['customer_email'] . $v['customer_mobile']] = $v;
}

Answer 5

我的回答是，你根本不应该在 PHP 中这样做。在您提出的案例中，数据应该 checked/validated/filtered 仅在数据库端。如果有重复，那你根本不用去取数据！

运行仅检查数据库中冗余的查询。只有在没有冗余的情况下才获取数据。

如果有很多数据，那么您将节省大量数据获取并从头开始循环数据。

祝你好运。

Answer 6

这是我的解决方案，运行良好。

    $name = array_column($array, 'name');
    $filteredKeys = array_unique($name);

    foreach (array_keys($filteredKeys) as $key => $value) {
    $filtered [] = $array[$value];
    }
      return  $filtered;
    }

如何检测多维关联数组中的重复值？

How to detect duplicate values in multidimensional associative array?

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