Merge values from different arrays to one with the same key

Question

I have two arrays:

Array
(
    [0] => 5
    [1] => 4
)
Array
(
    [0] => BMW
    [1] => Ferrari
)

And I would like to have tha

Answer 1

 $value){
        if(isset($c[$key])) {
            array_push($c[$key], $value);
        } else {
            $c[$key] = array($value);
        }
    }
}

Output:

Array
(
    [0] => Array
        (
            [0] => 5
            [1] => BMW
        )

    [1] => Array
        (
            [0] => 4
            [1] => Ferrari
        )

)