PHP 将两个数组合二为一，以通用 ID 为文本

Question

我有两个要组合的数组：

这是我的两个数组的输入（注意 Factor1 和 Factor2 是不同的，但是 YearMonth 在两个数组中是相同的）：

Array
(
    [0] => stdClass Object
        (
            [YearMonth] => 2022-01
            [Factor1] => 627
        )

    [1] => stdClass Object
        (
            [YearMonth] => 2021-12
            [Factor1] => 3006
        )

    [2] => stdClass Object
        (
            [YearMonth] => 2021-11
            [Factor1] => 2456
        )

    [3] => stdClass Object
        (
            [YearMonth] => 2021-10
            [Factor1] => 1482
        )

    [4] => stdClass Object
        (
            [YearMonth] => 2021-09
            [Factor1] => 1266
        )

    [5] => stdClass Object
        (
            [YearMonth] => 2021-08
            [Factor1] => 1981
        )
)

Array
(
    [0] => stdClass Object
        (
            [YearMonth] => 2022-01
            [Factor2] => 380
        )

    [1] => stdClass Object
        (
            [YearMonth] => 2021-12
            [Factor2] => 1773
        )

    [2] => stdClass Object
        (
            [YearMonth] => 2021-11
            [Factor2] => 769
        )

    [3] => stdClass Object
        (
            [YearMonth] => 2021-10
            [Factor2] => 700
        )

    [4] => stdClass Object
        (
            [YearMonth] => 2021-09
            [Factor2] => 608
        )

    [5] => stdClass Object
        (
            [YearMonth] => 2021-08
            [Factor2] => 859
        )
)

这是我希望的输出：

Array
(
    [0] => stdClass Object
        (
            [YearMonth] => 2022-01
            [Factor1] => 627
            [Factor2] => 380
        )

    [1] => stdClass Object
        (
            [YearMonth] => 2021-12
            [Factor1] => 3006
            [Factor2] => 1773
        )

    [2] => stdClass Object
        (
            [YearMonth] => 2021-11
            [Factor1] => 2456
            [Factor2] => 769
        )

    [3] => stdClass Object
        (
            [YearMonth] => 2021-10
            [Factor1] => 1482
            [Factor2] => 700
        )

    [4] => stdClass Object
        (
            [YearMonth] => 2021-09
            [Factor1] => 1266
            [Factor2] => 608
        )

    [5] => stdClass Object
        (
            [YearMonth] => 2021-08
            [Factor1] => 1981
            [Factor2] => 859
        )
)

我试过 array_merge() 但它只是将第二个数组附加到第一个数组的末尾。

当我尝试时：

$array3 = [];
foreach (array_merge($array1, $array2) as $row) {
    $array3[$row['YearMonth']] = ($array3[$row['YearMonth']] ?? []) + $row;
}

我收到此错误：

<b>Fatal error</b>:  Uncaught Error: Cannot use object of type stdClass as array in /var/www/html/wp-content/plugins/ad-inserter-pro/class.php(606) : eval()'d code:23

感谢您提供的任何帮助。谢谢。

Answer 1

尝试这样的事情

// loop thru 1st array using & to treat value as a reference, so that we can modify values in that array 
foreach ($array1 as &$value) {

  // loop through 2nd array
  foreach ($array2 as $value2) {

    // look for matching YearMonth (use -> because they are objects)
    if ($value->YearMonth === $value2->YearMonth) {

       // when a match is found, copy the Factor2 value
       $value->Factor2 = $value2->Factor2

       // for efficiency exit the 2nd loop, because there is no point checking any more rows if we have already found the match
       break;
    }
  }

  // after exiting the 2nd loop, code will carry on here, and keep checking values in the 1st loop

}

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