PHP Array将两个键控数组合并为一个数组

Question

I am two arrays both containning 4 keyed values. They both have the same columns - how would I merge them like so:

Array 1:

Author|Download|Rating|Count
person|23      | 5    | 0
peter |45      | 4    | 0

Array 2:

Author|Download|Rating|Count
      | 0      |0     | 3
      | 0      |0     | 5

Becomes a single array:

Author|Download|Rating|Count
person|23      | 5    | 3
peter |45      | 4    | 5

This is done via two SQL Queries like shown:

Array 1

 while ($stmt->fetch()) 
        {
            $array = array (
                    'Author' => $author,
                    'Download' => $download,
                    'Rating' => $rating,
                    'Count' => '',
                    );                  
        }   

Array 2

while ($stmt->fetch()) 
        {
            $array = array (
                    'Author' => '',
                    'Download' => '',
                    'Rating' => '',
                    'Count' => $count,
                    );                  
        }

How would I get these into a single Array? I know one could do this via loop but is there an easier way to do this?