PHP -合并两个值匹配的关联数组

Question

我有两个需要合并的数组。我可以循环遍历每个数组并手动合并。但是，是否有内置的功能来做到这一点呢？

数组1：

Array
(
[0] => Array
    (
        [detail_image_id] => 6389
        [product_name] => Starter broadband Package
    )

[1] => Array
    (
        [detail_image_id] => 6358
        [product_name] => Starter broadband Package
    )
)

数组2：

Array
(
[0] => Array
    (
        [detail_image_id] => 6358
        [guid] => http://xxx/wp-content/uploads/2018/04/broadband-4mbs-wingle.jpg
    )

[1] => Array
    (
        [detail_image_id] => 6389
        [guid] => http://xxx/wp-content/uploads/2018/04/broadband-4mbs-charji.jpg
    )
)

预期输出数组是：

Array
(
[0] => Array
    (
        [detail_image_id] => 6389
        [product_name] => Starter broadband Package
        [guid] => http://xxx/wp-content/uploads/2018/04/broadband-4mbs-charji.jpg
    )

[1] => Array
    (
        [detail_image_id] => 6358
        [product_name] => Starter broadband Package
        [guid] => http://xxx/wp-content/uploads/2018/04/broadband-4mbs-wingle.jpg
    )
)

我只从数组中添加了一个样本。阵列很大。对于循环和迭代器，我们是否可以使用像array_merge()或array_map()这样的PHP函数而不是手动操作呢？

Answer 1

更老更聪明:我从几年前就把我的答案擦掉了，因为我不再推荐这些技巧了。将数组合并到一个foreach()循环中，然后在相关行中“联合”(+作为数组联合操作符)数据，这将是最简洁和最有效的。

空合并运算符(??)用于确保总是有“联合”的东西。

代码：(演示)

$result = [];
foreach (array_merge($array1, $array2) as $row) {
    $result[$row['detail_image_id']] = ($result[$row['detail_image_id']] ?? []) + $row;
}

var_export(array_values($result));

输出：

array (
  0 => 
  array (
    'detail_image_id' => '6389',
    'product_name' => 'Starter broadband Package',
    'guid' => 'http://xxx/wp-content/uploads/2018/04/broadband-4mbs-charji.jpg',
  ),
  1 => 
  array (
    'detail_image_id' => '6358',
    'product_name' => 'Starter broadband Package',
    'guid' => 'http://xxx/wp-content/uploads/2018/04/broadband-4mbs-wingle.jpg',
  ),
)

Answer 2

你可以这样做：

$arr1 = array(); //Your array 1
$arr2 = array(); //Your array 2

//Make a temp array to that use detail_image_id as the key
$arr1Temp = array_combine( array_column($arr1,'detail_image_id'), $arr1 );
$arr2Temp = array_combine( array_column($arr2,'detail_image_id'), $arr2 );

//Get All unique detail_image_id from 2 arrays. 
//This is to make sure that all detail_image_id's will be included. 
//detail_image_id on 2nd array might not be present on the 1st one
$imgIds = array_unique(array_merge( array_keys($arr1Temp), array_keys($arr2Temp) ));

//Do a simple foreach loop
$result = array();
foreach( $imgIds as $val ) {
    $result[] = array_merge( $arr1Temp[$val], $arr2Temp[$val] );
}

print_r( $result );

这将导致：

Array
(
    [0] => Array
        (
            [detail_image_id] => 6389
            [product_name] => Starter broadband Package
            [guid] => http://xxx/wp-content/uploads/2018/04/broadband-4mbs-charji.jpg
        )

    [1] => Array
        (
            [detail_image_id] => 6358
            [product_name] => Starter broadband Package
            [guid] => http://xxx/wp-content/uploads/2018/04/broadband-4mbs-wingle.jpg
        )

)

Answer 3

您可以使用array_column()和array_combine()的组合来使用detail_image_id作为键创建引用数组。然后，使用foreach()循环，可以使用运算符合并数组。

$array1 = [
    ['detail_image_id' => '6389', 'product_name' => 'Starter broadband Package'],
    ['detail_image_id' => '6358', 'product_name' => 'Starter broadband Package']
];
$array2 = [
    ['detail_image_id' => '6358', 'guid' => 'http://xxx/wp-content/uploads/2018/04/broadband-4mbs-wingle.jpg'],
    ['detail_image_id' => '6389', 'guid' => 'http://xxx/wp-content/uploads/2018/04/broadband-4mbs-charji.jpg']
];

// create associative array with detail_image_id as key,
$out = array_combine(array_column($array1, 'detail_image_id'), $array1);
foreach ($array2 as $item) {
    $key = $item['detail_image_id']; // shortcut for the key,
    $out[$key] = $out[$key] + $item; // merge arrays
}
print_r(array_values($out)); // reset to indexed keys (0,1,2...) 

输出：

Array
(
    [0] => Array
        (
            [detail_image_id] => 6389
            [product_name] => Starter broadband Package
            [guid] => http://xxx/wp-content/uploads/2018/04/broadband-4mbs-charji.jpg
        )

    [1] => Array
        (
            [detail_image_id] => 6358
            [product_name] => Starter broadband Package
            [guid] => http://xxx/wp-content/uploads/2018/04/broadband-4mbs-wingle.jpg
        )

)