PHP 比较和更改多维数组中的某些元素

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具有空值，并将它们替换为第一个数组中的对应值。

Example:

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

Result:

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

以下代码已经适用于此。

$keys = array_keys($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二维数组怎么办？在这种情况下，正确的方法是什么？假设这两个二维数组是：

$superheroes_complete = array(
    "spiderman" => array(
        "name" => "Peter Parker",
        "email" => "[email protected] /cdn-cgi/l/email-protection",
    ),
    "superman" => array(
        "name" => "Clark Kent",
        "email" => "[email protected] /cdn-cgi/l/email-protection",
    ),
    "ironman" => array(
        "name" => "Harry Potter",
        "email" => "[email protected] /cdn-cgi/l/email-protection",
    )
);

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

期待：

$superheroes = array(
    "spider-man" => array(
        "name" => "Peter Parker",
        "email" => "[email protected] /cdn-cgi/l/email-protection",
    ),
    "super-man" => array(
        "name" => "Clark Kent",
        "email" => "something",
    ),
    "iron-man" => array(
        "name" => "Harry Potter",
        "email" => "another one",
    )
);

非常感谢并提前感谢您！

您已经向数据添加了另一个级别，因此您也可以使用第二个级别向检查添加另一个级别foreach loop:

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