This function returns data of specific photo's information.
Arguments
api_key
Flickr API key. If api_key is `NULL`, the function uses
[getFlickrAPIKey()] to use the environment variable "FLICKR_API_KEY" as the
key.
photo_id
The id of the photo to get information for.
output
Output data type. Supported options include "all", "location",
"date", "url" or "tags". If output = "all", the function returns a list
with all available data. Otherwise the function returns a data frame.