Alberto - 1 year ago 76
PHP Question

# PHP Compare keys and change certain values from a multidimensional array with corresponding keys' values from a simple array

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' => 'peterparker@mail.com',
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" => "clarkkent@mail.com",
),
"ironman" => array(
"name" => "Harry Potter",
"email" => "harrypotter@mail.com",
)
);
``````

Expectation:

``````\$superheroes_empty = array(
"spiderman" => array(
"name" => "Peter Parker",
"email" => "peterparker@mail.com",
),
"superman" => array(
"name" => "Clark Kent",
"email" => "clarkkent@mail.com",
),
"ironman" => array(
"name" => "Harry Potter",
"email" => "harrypotter@mail.com",
)
);
``````

Here is one way to do this using `array_walk_recursive`:
``````array_walk_recursive(\$superheroes_empty, function(&\$v, \$k) use (\$superheroes_complete) {
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.