Merge and group by several arrays

Question

I need to merge associative arrays and group by the name. Say I have such 3 arrays:

ARRAY1
    \"/path/file.jpg\"  =>  2, 
    \"/path/file2.bmp\" =>  1,
          


        

Answer 1

one possible way

$rtn = array();
foreach ($array1 as $key=>$val)
{
  $rtn[$key]+=$val;
}

foreach ($array2 as $key=>$val)
{
  $rtn[$key]+=$val;
}

foreach ($array2 as $key=>$val)
{
  $rtn[$key]+=$val;
}

the above will assign the filename, SUM(val) as an associative array into $rtn