PHP比较键并从多维数组中更改某些值，并使用简单数组中的相应键值

Question

I have two arrays (one simple and one multidimensional) and I want to verify if certain keys from the multidimensional array have empty values and replace them with their correspondent values from the simple array.

Solution for both simple arrays and/or 2D arrays is here:

PHP Compare and change certain elements in multidimensional arrays

But what would be the solution in the situation above?

Example of simple array:

$superheroes_complete = array(
    1 => 'one',
    'two' => 'two',
    3 => 'three',
    'email' => '[e-mail]',
    5 => 'cinco',
    6 => 'six',
    'name' => 'Clark Kent',
    8 => 'eight'
);

Example of multidimensional array:

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

Expectation:

$superheroes_empty = 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]",
    )
);

Thank you in advance.

Answer 1

Here is one way to do this using array_walk_recursive:

array_walk_recursive($superheroes_empty, function(&$v, $k) use ($superheroes_complete) {
    if ($v === '' && isset($superheroes_complete[$k])) {
        $v = $superheroes_complete[$k];
    }
});

This will fill in any empty values if a corresponding key is found in $superheroes_complete. Since this makes replacements by reference, it will directly change the $superheroes_empty array, so if you still need the one with empty values, make a copy before using this.