WP Super Cache shows DONOTCACHEPAGE defined for every page viewed

Try renaming your .htaccess file then re-saving your permalinks and wp-super-cache settings.

You can also try Quick Cache.

Now my main error log of my site is filling with the following two error lines regarding to WP Super Cache (this is a good thing actually).

These are the two lines that keep repeating:

[06-Dec-2011 16:36:33] PHP Warning: Invalid argument supplied for foreach() in /home3/longmead/public_html/just-thinkin/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 156
[06-Dec-2011 16:36:33] PHP Warning: Invalid argument supplied for foreach() in /home3/longmead/public_html/just-thinkin/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 452

Line 156 of “/just-thinkin/wp-content/plugins/wp-super-cache/wp-cache-phase2.php” reads:

foreach ( $cache_rejected_uri as $expr ) {
		if( $expr != '' && @preg_match( "~$expr~", $uri ) )
			return true;

Line 452 of “/home3/longmead/public_html/just-thinkin/wp-content/plugins/wp-super-cache/wp-cache-phase1.php” reads:

foreach ($cache_rejected_user_agent as $expr) {
		if (strlen($expr) > 0 && stristr($headers["User-Agent"], $expr))
			return true;

Heh, well, that’s all fine and dandy but I have no idea what is “invalid” about it and no idea how to fix it.

Still looking at the error log in my site’s root directory and every time I view a page in another browser (logged out) it adds the same two lines as shown previously to the log.

If you can ssh to your server use grep to find out where DONOTCACHEPAGE is defined. It might be hidden away somewhere, maybe if you were testing something months ago?

You could also try adding checks for that constant in wp-settings.php – use error_log to flag it in a log file if it’s defined. Start at the top and move the check down the file and you might find that some file defines it and when it’s included the error_log will run.

Kirk – make sure the “Rejected URIs” and “Rejected User Agents” fields on the advanced settings page are set to something.

Sorry for the delay in replying. Things got busy for the last few days.

The problem turned out to be a conflict with the last two versions (3.9.7 and 3.9.8) of the Text Link Ads plugin for WordPress. After enabling WP Super Cache debugging and checking the resulting log, it showed that there was a “DONOTCACHE is defined” statement after every page viewed on my site as long as the TLA plugin was activated. Although I couldn’t actually find this exact statement in the options table in my site’s DB I’m pretty sure that’s where it was being added. It’s certainly not in the source code of any page/post on my site. Once the TLA plugin was deactivated and removed, WP Super Cache began working properly once more.

I’ve run both plugins side by side for nearly two years now without a problem but apparently when TLA jumped from version 3.5.1 directly to 3.9.7 the problem began. Unfortunately, 3.5.1 no longer works with the latest version of WordPress so I can’t do any compatibility tests. TLA support acknowledged the problem but offers no solution at the moment. They said they’d look into it though.

Since it’s more important to me to keep my site properly cached than having a steady source of packet change for coffee and donuts every month, the TLA plugin got booted. Thanks much for the help Donncha and bh_WP_fan. I’m marking this topic resolved.