PHP比较和更改多维数组中的某些元素 [英] PHP Compare and change certain elements in multidimensional arrays

问题描述

简而言之，我有两个简单的数组，我想验证第二个数组中的某些键是否为空值，并将它们替换为第一个数组中的对应值。

To be short, I have two simple arrays and I want to verify if certain keys from the second array have empty values and replace them with their correspondent values from the first array.

示例：

$a1 = [ 1 => 'one', 2 => 'two', 3 => 'three',5=>'cinco', 6=>'six'];
$a2 = [ 2 => 'two', 5=>'five', 6=>'' ];

结果：

Array
(
    [2] => two
    [5] => five
    [6] => six
)

以下代码已对此有效。

$keys = array_keys($a1);
foreach ($keys as $k)
{
    if ((isset($a2[$k])) && (($a2[$k]) == '')) {
     $a2[$k] = $a1[$k];
    }
}
print_r($a2);

但是如果我们想将其应用于两个2D数组怎么办？在这种情况下，正确的方法是什么？假设这两个2D数组将是：

But what if we want to apply this for two 2D arrays? What will be the proper approach in that case? Let's say these two 2D arrays will be:

$superheroes_complete = array(
    "spiderman" => array(
        "name" => "Peter Parker",
        "email" => "[e-mail]",
    ),
    "superman" => array(
        "name" => "Clark Kent",
        "email" => "[e-mail]",
    ),
    "ironman" => array(
        "name" => "Harry Potter",
        "email" => "[e-mail]",
    )
);

$superheroes_empty = array(
    "spiderman" => array(
        "name" => "Peter Parker",
        "email" => "",
    ),
    "superman" => array(
        "name" => "Clark Kent",
        "email" => "something",
    ),
    "ironman" => array(
        "name" => "Harry Potter",
        "email" => "another one",
    )
);

期望：

$superheroes = array(
    "spider-man" => array(
        "name" => "Peter Parker",
        "email" => "[e-mail]",
    ),
    "super-man" => array(
        "name" => "Clark Kent",
        "email" => "something",
    ),
    "iron-man" => array(
        "name" => "Harry Potter",
        "email" => "another one",
    )
);

非常感谢，并提前谢谢！

Much appreciation and thank you in advance!

推荐答案

您已经在数据中添加了另一个级别，因此您也可以使用第二个 foreach 循环：

You've added another level to your data, so you can just add another level to your checking as well with a second foreach loop:

foreach ($superheroes_complete as $hero => $info) {
    foreach ($info as $key => $value) {
        if (empty($superheroes_empty[$hero][$key])) {
            $superheroes_empty[$hero][$key] = $value;
        }
    }
}

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