Prevent Concurrent Logins | Plugin Review Network

Prevents users from staying logged into the same account from multiple places.

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Deters members/subscribers from sharing their accounts with others
Hardens security by destoying old sessions automatically
Prompts old sessions to login again if they want to continue
Ideal for membership sites and web applications

Important: If you plan to network-activate this plugin on a multisite network, please install the Proper Network Activation plugin beforehand.

Development of this plugin is done on GitHub. Pull requests welcome. Please see issues reported there before going to the plugin forum.

Where are the options for this plugin?

This plugin does not have a settings page. Simply put, I don't like bloating my plugins with a bunch of options.

Instead, I try to develop functionality using the 80/20 principle so that for 80% of use cases you all you need to do is activate the plugin and it "just works".

For the other 20% of you who want things to behave differently there are hooks available in the plugin so you can customize default behaviors.

Can I still allow concurrent logins for certain users?

Yes, simply add this code to your theme's functions.php file or as an MU plugin:

function my_pcl_whitelist_user_ids( $prevent, $user_id ) {

    $whitelist = array( 1, 2, 3 ); // Provide an array of whitelisted user IDs

    return in_array( $user_id, $whitelist ) ? false : $prevent;

}
add_filter( 'pcl_prevent_concurrent_logins', 'my_pcl_whitelist_user_ids', 10, 2 );

Or this code to bypass users with certain roles:

function my_pcl_whitelist_roles( $prevent, $user_id ) {

    $whitelist = array( 'administrator', 'editor' ); // Provide an array of whitelisted user roles

    $user = get_user_by( 'id', absint( $user_id ) );

    $roles = ! empty( $user->roles ) ? $user->roles : array();

    return array_intersect( $roles, $whitelist ) ? false : $prevent;

}
add_filter( 'pcl_prevent_concurrent_logins', 'my_pcl_whitelist_roles', 10, 2 );