Support » Plugins » WordPress 2.5 Share users table

Viewing 15 replies - 1 through 15 (of 26 total)
  • I am interested in how to do this as well. Thanks!

    So far it is partly like the 2.3 mod. Below is how my 2.5 shares. Now, this is for the same access across all shared blogs. I have not set it up to give unique access per blog.

    wp-config.php in the 2nd, 3rd, etc (not first install though).
    Before the line with define(‘ABSPATH’, dirname(__FILE__).’/’);

    // Let's add the code for sharing a user db table within the wordpress database.
    // Remember, all blogs must be installed to the same database, with unique prefix's.
    // These entries point to the single blog's userbase to share.
    define('CUSTOM_USER_TABLE', 'wp_users');
    // Uncomment this to use the same usermeta globally for roles.
    define('CUSTOM_USER_META_TABLE', 'wp_usermeta');

    Then I made the following change to wp-includes/wp-capabilities.php
    Find the line:
    $this->cap_key = $wpdb->prefix . 'capabilities';
    Change it too:
    $this->cap_key = ‘wp_capabilities’;

    I am getting this error:

    Fatal error: Cannot access empty property in /home/poppacket/domains/ on line 169

    1. Upgrade to 2.6.

    2. Make sure all WordPress instances on the same database.

    3. Say the primary blog have table prefix set to wp_ and the secondary ones with wp2_ wp3_ etc. Add the following in wp-config.php of the secondary installations:

    define('CUSTOM_USER_TABLE', 'wp_users');
    define('CUSTOM_USER_META_TABLE', 'wp_usermeta');

    Very neat with v 2.6!

    I have added the two lines shown above and get the following error:

    You do not have sufficient permissions to access this page

    Is there anything else I need alter in the user table?

    Just upgraded to 1.6.1 and decided to add another blog to a subdomain but wanted users spread over both blogs. Took a while but figured it out with some help from a guy named ringmaster (

    The problem appears to be a difference of opinion between users and WP programmers. Most users seem to think that a user should share the capabilities between blogs if they share the same database, where the programmers want the flexibility to allow users different caps between sites.

    harringtonjw, in short our problem is even though we have successfully shared the databases, with poppackets code, your users caps are not brought over and you dont have admin rights.

    To share user caps, you need to create another define in wp-config, I called mine CUSTOM_CAPABILITES_PREFIX and set it to the prefix of your master db.

    Now, in wp-includes/capabilities.php scroll down to WP_User and where it is has:

    $this->cap_key = $wpdb->prefix . 'capabilities';

    Replace it with this:

    if (defined ('CUSTOM_CAPABILITES_PREFIX')) {
      $this->cap_key = CUSTOM_CAPABILITES_PREFIX . 'capabilities';
    else {
      $this->cap_key = $wpdb->prefix . 'capabilities';

    After this, you should be able to log in to your new site with your master password successfully.

    The code worked for me perfectly but I am still running into the problem that users have to log in at each separate blog. Is there any way around this? Thanks.

    I have two blogs, one on WP 2.6.1, one on 2.4.*. I’d like to share the user data between those. Unfortunately when I’m applying these tips, it all works on the new blog (on 2.6.1) but on the old one I cannot login anymore with my credentials. Is this due to same database changes? Where are the caps held in the database? Do you know of any fix for that exept upgrading to 2.6.1 on all blogs (can’t do it for multiple reasons now).

    ron_g: I ran into this too and couldn’t really figure out a good way around it. From what I understand, it’s how sessions are supposed to work between domains, even if they are subdomains. I wonder if it could be possible to modify the login code to log the user into both domains? Something to look into…

    michuk: I would upgrade to the same version, I’m sure it’s possible, but there’s no telling what other problems you would run into with the differences.

    I installed 2 worpress with different prefix:
    blog_ (for my blog)
    portal_ (for the portal)

    I did all what you guys said here and sees work good but… good not mean perfect. When I try to log in to the Portal I couldn’t have access to the Blog admin panel (wp-admin). But when I log in to the Blog and check my Portal I could see the link that show the online/offline status said I am logged in and not logged out :S. Maybe I need to edit something from the wp-admin directory but I have no idea where I am novice in this and I need help so if you know could you tell me :<? Send me a e-mail to:

    Thank you.

    Hi All

    Thank you for all you comments here as they do help me to understand what wp is doing and how to update it.

    I’ve followed the steps above but still get the ‘You do not have sufficient permissions to access this page.’ on site number 2 !

    I’ve added the following to the wp-config file from poppacket

    define(‘CUSTOM_USER_TABLE’, ‘wp_users’);
    define(‘CUSTOM_USER_META_TABLE’, ‘wp_usermeta’);

    As per MarsChelios comments I have also added

    define(‘CUSTOM_CAPABILITIES_PREFIX’, ‘wp_’);

    and in capabilities.php I have changed

    $this->cap_key = $wpdb->prefix . ‘capabilities’;


    if (defined (‘CUSTOM_CAPABILITES_PREFIX’)) {
    $this->cap_key = CUSTOM_CAPABILITES_PREFIX . ‘capabilities’;
    else {
    $this->cap_key = $wpdb->prefix . ‘capabilities’;

    but still I get ‘You do not have sufficient permissions to access this page.’ Can someone please tell me what I’m doing wrong here ?

    In addition I want to share all the tables from my main site (excluding options) on site 2. I know I may have duplicate content issues on the search engines but I’m not that bothered about that.

    Please help if you can, thanks

    Actually I have the same problem. Tried with the code of Neil T and I doesnt work still, having the same error. “You do not have sufficient permissions to access this page.” hope you’ll be able to help us. 🙁

    Neil T and peterassman: There is a typo in the code.


    @neil T

    I’m sick in bed and amusing myself by answering forum questions today.

    With regard to your question about using the same tables in a second blog. You could just change the table prefix in the init action, while preserving the options. Put something like this in a plugin:

    function table_prefix_switch() {
        global $wpdb;
        $options = $wpdb->options; //Save the site 2 options table
        $wpdb->set_prefix('wp_'); //The prefix to site 1
        $wpdb->options = $options; //Put the options table back
    add_action('init', 'table_prefix_switch');

    I haven’t tested this, but have used $wpdb->set_prefix() often for various hacks and switching blogs this way works well.


    You my friend, are an absolute genius !

    I put that code in a plugin file, uploaded, activated and hey presto……….My 500 + articles from my other site appeared.

    Love it, thanks and get well soon 🙂

Viewing 15 replies - 1 through 15 (of 26 total)
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