ETA: Please check out Trac #19622 – There will be a new way to do this in WP 3.4

Before I get into this, you do not need to do anything to WordPress to comply with the EU cookie law. The legal whoo-hah is clear: Third party cookies (and cookies which track data across multiple sites) are the only ones they’re talking about. MultiSite installs are, technically, one site, all owned and managed by one person, so it’s fine., and anything else registered to Google would also be fine internally.

But if you’re dead set on this…. Let me explain first.

For WordPress, if someone comments on your blog, cookies are stored on their computer that store three things: name, email and website. Even then, they’re only put in when the user enters then. That would entail implicit agreement to having cookies put on your computer, wouldn’t it? Even if you have no idea what cookies are? That certainly is a problem. People don’t know what cookies are, why they’re on their computers, and what they can do. But is that the responsibility of website owners to educate? Certainly, you can easily add a checkbox to your comment for that says ‘save cookies,’ have it link back to an explanation about what’s going on, and make it required.

It would be pretty easy to flip WordPress around to not save cookies for non-logged in users.

First you change your KEYs and SALTS in the wp-config.php (you can get new ones at This will force all users to log back in.

Next you change your registration/login page to alert people to the cookies. There are plugins for this, and on BuddyPress you can edit your theme’s template page for registration easily. By having the login/registration page say ‘hey, you’re gonna get cookies if you log in!’ you’re now in compliance with EU law!

Finally you slap this your header (or functions or a mu-plugin file), to delete cookies on every single page you visit, which will prevent cookies from staying on people’s computer ONLY if they’re not logged in:

<?php if ( !is_user_logged_in() ) { wp_clear_auth_cookie(); } ?> 

One could go even further, making a check-box to permit cookies or not, though that would be far more complicated to track. This very basic way of making the code you own compliant is enough to get you through the day and keep the enforcers off your back.

Reader Interactions


  1. Esmi made an awesome plugin to help:

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