在PHP中两个关联数组的键上进行数组合并? [英] Array merge on key of two associative arrays in php?

问题描述

如何将这两个数组合并在一起?

How can I merge these two array together?

Array
(
[0] => Array
    (
        [id] => 5
        [cnt] => 14
    )

[1] => Array
    (
        [id] => 8
        [cnt] => 2
    )

)

Array
(
    [0] => Array
        (
            [id] => 8
            [binding] => hardcover
        )

    [1] => Array
        (
            [id] => 5
            [binding] => softcover
        )
)

预期结果是:

Array
    (
        [0] => Array
            (
                [id] => 5
                [binding] => softcover
                [cnt] => 14
            )

        [1] => Array
            (
                [id] => 8
                [binding] => hardcover
                [cnt] => 2
            )

    )

这两个数组的合并应该在[id]值上进行，而不是在任何类型的数组上进行.如何用php快速完成此操作?

The merge of these two array should happen on the [id] value and not on any sort of the array. How can I do this with php in a fast way?

推荐答案

$output = array();

$arrayAB = array_merge($arrayA, $arrayB);
foreach ( $arrayAB as $value ) {
  $id = $value['id'];
  if ( !isset($output[$id]) ) {
    $output[$id] = array();
  }
  $output[$id] = array_merge($output[$id], $value);
}

var_dump($output);

(可选)如果您想重置输出的键，只需执行以下操作:

Optionally if you want to reset output's keys, just do:

$output = array_values($output);

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