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History Plugin -> Undefined variable: anchor in /qa-include/qa-app-format.php(1452) : eval()'d code on line 287

0 votes
asked Jun 20, 2012 in Plugins by q2apro
retagged Jun 26, 2012 by q2apro

While I was trying to solve an issue with the history plugin, I discovered an error in my server logs which is possibly a bug of the history plugin:

Undefined variable: anchor in /qa-include/qa-app-format.php(1452) : eval()'d code on line 287

There is no variable "anchor" in line 287:
if (@$options['categoryview'] && isset($post['categoryname']) && isset($post['categorybackpath']))

Thanks @Merkus: The error is caused by line 287 in qa-history-layer.php:
$activity_url = qa_path_html(qa_q_request($params['postid'], $post['title']), null, qa_opt('site_url'),null,$anchor);


Q2A version: 1.5.1
commented Jun 26, 2012 by q2apro
I thought it could be the badges plugin ("Show list of source posts for each badge on user profile"), switched it off, but no changes. Error still appears.

I found a user with a history page, where - every time I load the page - the error is written to my error log: http://www.gute-mathe-fragen.de/user/Berliner?tab=history

There is nothing special about this user, 2 questions posted within last 2 weeks.

But I found out: It does not matter if you are logged in or not. Only loading the user history page leads to this error.

-> I disabled the plugin and loaded the user page, no error.

+ And this user history page brings up two times the error!

2 Answers

0 votes
answered Jun 26, 2012 by q2apro
Best answer

Alright, in qa-history-layer.php I replaced $anchor with null and the error disappeard:

change line 287:
$activity_url = qa_path_html(qa_q_request($params['postid'], $post['title']), null, qa_opt('site_url'),null,$anchor);

$activity_url = qa_path_html(qa_q_request($params['postid'], $post['title']), null, qa_opt('site_url'),null,null);

Hope that helps.

commented Jul 26, 2012 by ScottCher
What is the draw-back of making that change?  What does the $anchor parameter do and why is it causing this error (which I am also seeing now)
commented Jul 26, 2012 by q2apro
The function qa_path_html (see file qa-base.php) transfers the anchor into function qa_path which adds an anchor to the page. a link anchor to jump to comment / post etc.

e.g. http://www.question2answer.org/qa/16060/history-plugin-undefined-variable-anchor-include-format-code#16060

#16060 is the anchor!
+1 vote
answered Jun 24, 2012 by Merkus

The line number 287 refers to the file calling qa-app-format.php.

You need to locate line 287 in, probably, one of the history plugin files. My guess would be the layer file.


commented Jun 24, 2012 by q2apro
thanks for the tip. I will check this.