'attachmentcategory' => 
    array (size=3)
      'category1' => string 'Category1' (length=9)
      'category2' => string 'Category2' (length=9)
      'custom' => string 'Custom' (length=6)
  'price' => 
    array (size=3)
      5 => string '10' (length=2)
      10 => string '20' (length=2)
      '3.5' => string '10' (length=2)