tgeorge

Hmm… I guess Frederick was wrong when he said to put PHP start and end tags outside of MFUNC. They clearly have to be inside of MFUNC. Try this :

<!-- mfunc -->
<?php
echo popular_posts_views();
?>
<!-- /mfunc -->

There is a way to disable caching of a particular section of a page using MFUNC. Here is how. Replace this code :

<?php echo popular_posts_views(); ?>

with this code :

<?php
<!-- mfunc -->
echo popular_posts_views();
<!-- /mfunc -->
?>

I cannot test this myself. I hope it works.

To apply the modifications in the stylesheet, go to the “Minify” tab of W3TC and click on “empty cache”. Only the “Minify” is involved with stylesheets.

1. Open your FTP program and connect to your site.
2. Browse to the /public_html/ folder.
3. Edit the wp-config.php file (it’s a text file).
4. Find the line require_once(ABSPATH . 'wp-settings.php'); (it’s at the end).
5. Insert a new line before the previous line and paste define('WP_CACHE', true);

I had the same problem, and I solved it like this :

http://wordpress.org/support/topic/plugin-w3-total-cache-call-to-undefined-function-after-update?replies=3#post-2308798

This is perfectly normal. The cache files are stored in “/wp-content/w3tc/” and they get updated all the time (or at least, every time someone access a portion of your site). When you initiate an FTP backup, your FTP program makes a list of the files to backup, but by the time it finishes downloading, old cache files may already have been deleted, and new cache files may already have been created.

You can safely disregard such error messages, and if your backup procedure allows excluding certain folders, then exclude “/wp-content/w3tc/”. (It is more or less equivalent to the “Temporary Internet Files” folder for Internet Explorer.)

Go to the “Browser Cache” tab. Use the following settings for both the “CSS & JS” section and the “Media & Other Files” section :

[check] Set expires header
Expires header lifetime: 31536000 seconds
[check] Set cache control header
Cache Control policy: cache with max-age

Don’t forget to save settings, and to click on “Re-Test Page” on the GTmetrix site.