一次又一次地向多维数组添加“简单”数组元素

debugcn 发表于 Dev

ddl

问题：我想将Array2的值一个接一个地添加到多维数组（array1）。

阵列1：

Array
(
    [0] => Array
        (
            [date] => 2020-01-01
            [itemsSold] => 25.00000000
        )

    [1] => Array
        (
            [date] => 2020-01-02 
            [itemsSold] => 50.00000000
        )

    [2] => Array
        (
            [date] => 2020-01-03 
            [itemsSold] => 25.00000000
        )
)

数组2：

Array
(
    [0] => 10
    [1] => 15
    [2] => 25
)

目标：

Array
(
    [0] => Array
        (
            [date] => 2020-01-01
            [itemsSold] => 25.00000000
            [0] => 10
        )

    [1] => Array
        (
            [date] => 2020-01-02 
            [itemsSold] => 50.00000000
            [0] => 15
        )

    [2] => Array
        (
            [date] => 2020-01-03 
            [itemsSold] => 25.00000000
            [0] => 25
        )
)

自2021年1月以来，我一直在学习编程，所以我得到的最佳解决方案是：

foreach ($array1 as $main => $value) {
   foreach ($array2 as $sec => $entry) {
      $array1[$main][] = $array2[$sec];
   }
}
print_r($array1);

输出：

Array
(
    [0] => Array
        (
            [date] => 2020-01-01
            [itemsSold] => 25.00000000
            [0] => 10
            [1] => 15
            [2] => 25
        )

    [1] => Array
        (
            [date] => 2020-01-02 
            [itemsSold] => 50.00000000
            [0] => 10
            [1] => 15
            [2] => 25
        )

    [2] => Array
        (
            [date] => 2020-01-03 
            [itemsSold] => 25.00000000
            [0] => 10
            [1] => 15
            [2] => 25
        )
)

循环中我在做什么错？我怎样才能将array2的值一对一地输入到array1中？

谢谢你的帮助 ;）

迈克尔·伯科夫斯基

代码的问题在于，您不需要时在另一个循环中嵌套了一个循环。相反，请使用循环格式，foreach ($array1 as $key => $value)以便您可以捕获其索引$key，然后将其用作的索引$array2。

foreach ($array1 as $key => $value) {
  // Append from $array2 by its index $key
  // Using [] will append at index [0]
  // You can modify $array1 inside the loop if you 
  // target it by $key. Notice that we are not using
  // $value at all in this loop - only the $key matters.
  $array1[$key][] = $array2[$key]; 
}
print_r($array1);

foreach如果使用&引用，还可以直接修改该值。这有点短：

foreach ($array1 as $key => &$value) {
  // Looping over references to $array1 sub-arrays
  // means that $value can be modified directly
  $value[] = $array2[$key];
}
print_r($array1);

通过引用进行迭代在PHP 手册中进行了描述foreach

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