How to combine sequential array with associative array in order:

Example:

```
$sequentialArray = [123, 'Jonh'];
$associativeArray = ['ID' => '321', 'name' => 'Paul', 'lastName' => 'Wood'];

mergeArray($sequentialArray, $associativeArray);

```

**Return:**

```
Array
(
    [ID] => 123
    [name] => Jonh
    [lastName] => Wood
)

```