PHP map named array to another named array - php

Question

I have the following code for generating a new array:
$languages = array_keys(['French'=>4, 'Spanish'=>2, 'German'=>6, 'Chinese'=>8]);
function generateLanguageRules($language)
{
return ["seatsAllocatedFor$language"=>"numeric|max:300"];
}
array_map('generateLanguageRules', $languages);
//Output:
array(
0 => array(
'seatsAllocatedForFrench' => 'numeric|max:300'
),
1 => array(
'seatsAllocatedForSpanish' => 'numeric|max:300'
),
2 => array(
'seatsAllocatedForGerman' => 'numeric|max:300'
),
3 => array(
'seatsAllocatedForChinese' => 'numeric|max:300'
)
)
I'm wondering if there is an easier way to output a flat array, instead of a nested one? I'm using Laravel. Are there maybe some helper functions that could do this?
UPDATE:
One possible Laravel specific solution:
$languages = array_keys(['French'=>4, 'Spanish'=>2, 'German'=>6, 'Chinese'=>8]);
$c = new Illuminate\Support\Collection($languages);
$c->map(function ($language){
return ["seatsAllocatedFor$language"=>"numeric|max:300"];
})->collapse()->toArray();

Answer 1

I dont know if laravel has a built-in method for that, (haven't used it yet). But alternatively, you could use RecursiveArrayIterator in conjunction to iterator_to_array() to flatten it and assign it. Consider this example:
$languages = array_keys(['French'=>4, 'Spanish'=>2, 'German'=>6, 'Chinese'=>8]);
function generateLanguageRules($language) {
return ["seatsAllocatedFor$language"=>"numeric|max:300"];
}
$data = array_map('generateLanguageRules', $languages);
$data = iterator_to_array(new RecursiveIteratorIterator(new RecursiveArrayIterator($data)));
echo "<pre>";
print_r($data);
echo "</pre>";
Sample Output:
Array
(
[seatsAllocatedForFrench] => numeric|max:300
[seatsAllocatedForSpanish] => numeric|max:300
[seatsAllocatedForGerman] => numeric|max:300
[seatsAllocatedForChinese] => numeric|max:300
)