PHP根据给定索引的匹配值合并数组

Question

我有两个这样的数组：

数组1

Array
(
    [0] => Array
        (
            [ID] => 101
            [Code] => 1075
            [Date] => 2012-03-03 17:13:12.433
        )

    [1] => Array
        (
            [ID] => 103
            [Code] => 175
            [Date] => 2012-09-05 20:30:02.217
        )

    [2] => Array
        (
            [ID] => 109
            [Code] => 178
            [Date] => 2012-07-05 20:30:02.217
        )

)

数组2

Array
(
    [0] => Array
        (
            [Amount] => 1234
            [ID] => 101
        )

    [1] => Array
        (
            [Amount] => 1342
            [ID] => 103
        )

    [2] => Array
        (
            [Amount] => 0
            [ID] => 0
        )

)

我使用此代码根据 ID 索引的匹配值将它们组合起来。

      $combined = array();
           foreach ($arr as $arrs) {
                   $comb = array('ID' => $arrs['ID'], 'Code' => $arrs['Code'],'Date' => $arrs['Date'],'Amount' => '');
                   foreach ($arr4 as $arr2) {
                       if ($arr2['ID'] == $arrs['ID']) {
                           $comb['Amount'] = $arr2['Amount'];
                           break;
                       }
                       else {
                        $comb['Amount'] = $arr2['Amount'];
                       }
                   }
               $combined[] = $comb;
           }
echo print_r($combined);

这是我从这段代码中得到的期望输出：

Array
(
    [0] => Array
        (
            [ID] => 101
            [Code] => 1075
            [Date] => 2012-03-03 17:13:12.433
            [Amount] => 1234
        )

    [1] => Array
        (
            [ID] => 103
            [Code] => 175
            [Date] => 2012-09-05 20:30:02.217
            [Amount] => 1342
        )

    [2] => Array
        (
            [ID] => 109
            [Code] => 178
            [Date] => 2012-07-05 20:30:02.217
            [Amount] => 0
        )

)

我想优化代码使得

$comb = array('ID' => $arrs['ID'], 'Code' => $arrs['Code'],'Date' => $arrs['Date'],'Amount' => ''); 

应该动态生成而不是硬编码。 而不是$comb['Amount'] = $arr2['Amount'];，我希望代码自动将所有其他字段添加到ID匹配的第一个数组中。

我如何做到这一点？

Answer 1

除了ID之外，使其完全动态化的最简单解决方案，如下所示：

$arr2 = array_column($array2, "ID");

$finalArray = array();
foreach($array1 as $arr){
    $key = array_search($arr['ID'], $arr2);
    if($key ===false){
        $key = array_search(0, $arr2);
    }
    unset($array2[$key]['ID']);
    $finalArray[] =     array_merge($arr,$array2[$key]);
}

print_r($finalArray);

输出：- https://3v4l.org/1sDJs

Answer 2

先用ID作为key：

$arr1 = array_column($arr1, null, "ID");
$arr2 = array_column($arr2, null, "ID");

然后对key进行排序（解决原索引不一样的问题：

ksort($arr1);
ksort($arr2);

然后使用array_map作为：

$res = array_map('array_merge', $arr1, $arr2);

在末尾使用array_values 忽略ID 键。

如果您有另一个包含 ID 字段的数组，您可以在它们上使用相同的逻辑 - 请注意 array_map 可以获得超过 2 个输入数组...

参考：array_column、array_map、array_merge、ksort

现场示例：3v4l

已编辑：

使用模板修复元素丢失的问题：

$keys = array_merge(array_keys($a[0]), array_keys($b[0]));
$template = array_combine($keys, array_fill(0, count($keys), null)); // create array of null for all keys
$a = array_column($a, null, "ID");
$b = array_column($b, null, "ID");
ksort($a);
ksort($b);


$res = array_map(function ($e1, $e2) use ($template){
    if ($e1 && $e2) return array_merge($e1, $e2); // if exist merge
    $e = $e1 ? $e1 : $e2; //get the exist element
    return array_replace ($template, $e); // add it
}, $a, $b);

请注意，此解决方案仅对 2 个数组有效 - 它可以概括，但我将其留给您

现场示例：3v4l

Answer 3

我调整你的代码来做你需要的，这里是对我有用的完整代码：

<?php

$arr=Array(
     Array("ID" => 101, "Code" => 1075, "Date" => "2012-03-03 17:13:12.433"),
    Array("ID" => 103, "Code" => 175, "Date" => "2013-03-03 17:13:12.433"),
    Array("ID" => 109, "Code" => 178, "Date" => "2014-03-03 17:13:12.433")
);

$arr4 = Array(
    Array("ID" => 101, "Amount" => 1234),
    Array("ID" => 103, "Amount" => 1342),
    Array("ID" => 0, "Amount" => 0)
);

$combined = array();

foreach ($arr as $i => $arrs) {
    $combined['ID'][$i] = $arrs['ID'];
    $combined['Code'][$i] = $arrs['Code'];
    $combined['Date'][$i] = $arrs['Date'];

    foreach ($arr4 as $arr2) {
        if ($arr2['ID'] == $arrs['ID']) {
            $combined['Amount'][$i] = $arr2['Amount'];
            break;
        }
    }

    if (!isset($combined['Amount'][$i])) {
        $combined['Amount'][] = 0;
    }

}

echo print_r($combined);

?>

如果您出于不同原因需要进一步操作，我建议您阅读 array_keys 和 array_values 方法，它们非常有用。

Answer 4

$firstArray = [
    [
        'ID' => 101,
        'Code' => 1075,
        'Date' => '2012-03-03 17:13:12.433',
    ],
    [
        'ID' => 103,
        'Code' => 175,
        'Date' => '2012-09-05 20:30:02.217',
    ],
    [
        'ID' => 109,
        'Code' => 178,
        'Date' => '2012-07-05 20:30:02.217',
    ],
];

$secondArray = [
    [
        'ID' => 101,
        'Amount' => 1234,
    ],
    [
        'ID' => 103,
        'Amount' => 1342,
    ],
    [
        'ID' => 0,
        'Amount' => 0,
    ],
];

class DTO implements \Serializable
{
    /** @var int */
    private $id;

    /** @var int */
    private $code;

    /** @var string */
    private $date;

    /** @var int */
    private $amount = 0;

    /**
     * {@inheritDoc}
     */
    public function serialize()
    {
        return [
            'ID' => $this->id,
            'Code' => $this->code,
            'Date' => $this->date,
            'Amount' => $this->amount,
        ];
    }

    /**
     * {@inheritDoc}
     *
     * @param array $serialized
     */
    public function unserialize($serialized): self
    {
        $this->id = $serialized['ID'];
        $this->code = $serialized['Code'];
        $this->date = $serialized['Date'];
        $this->amount = $serialized['Amount'] ?? 0;

        return $this;
    }
}

$thirdArray = [];
foreach ($secondArray as $item) {
    $id = $item['ID'];
    unset($item['ID']);
    $thirdArray[$id] = $item;
}

$thirdArrayKeys = array_keys($thirdArray);
foreach ($firstArray as &$item) {
    $id = $item['ID'];
    $dto = new DTO();
    $dto->unserialize($item);
    if (in_array($id, $thirdArrayKeys)) {
        $dto = $dto->unserialize(array_merge($item, $thirdArray[$id]));
    }

    $item = $dto->serialize();
}

http://sandbox.onlinephpfunctions.com/code/ee72a1c89782f4eef25a1143816f237ca6af129c