Thanks for the contribution, @magicmonk! That's definitely a cool feature to have and should be useful to people looking for some older posts - great work!

Some feedback: the indentation of your code seems pretty inconsistent in places. Sometimes it's 2, 4, 8 or even 0. I would recommend you stick to the best practices of each language (e.g. HTML would be 2 spaces).

Another thing I would like to remark is that some comments are not very useful.

if ($voter&&$mode=="upvote") {
// get list of results
$results = $articlelistmodel -> gethistory($date,$todate,$voter);

It should be pretty obvious what you are doing here, so there isn't much need to add a comment describing what is happening imo.

Finally, since you made a pull request (which is great) it would be nice if you could link it in the body of your contribution, but that's just for our convenience of course.

Good to see you back contributing and working on improving SteemFriends!

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