How to write a plugin to add users to a mail list

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I run a multi-site blog with about 300 sites.

I have an idea that I want to write a plugin that in order to add all administrators of blogs to a MailMan mail-list. I just want administrators though, I don’t want to add editors and subscribers to this email list.

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I want to capture the event of being assigned an administrator of a blog. Then I’ll send an email to the subscribe email address of my mail list to automatically add the person.

So I was wondering which hook should I use ? I think I want to send an email every time a person is set as an administrator. I don’t care if they are removed as an administrator.

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  1. You would hook into profile_update and user_register. First check to see if it’s a new user and whether she is an admin/editor.

    Then send the mail. Same story with updating the user: see if the role has changed, and whether the new role is admin or editor. 

    <?php
add_action( 'profile_update', 'wpse33949_profile_update' );
add_action( 'user_register', 'wpse33949_profile_update' );
function wpse33949_profile_update( $user_id, $old_user_data = false )
{
    // get the updated user data
    $userdata = get_userdata( $user_id );

    // whatever you need to send here
    $message = "Sign up for my email!";
    $subject = "Mailing List";

    if( ! $old_user_data && in_array( $userdata->user_role, array( 'editor', 'administrator' ) ) )
    {
        // we're inserting a new user...
        wp_mail( $userdata->user_email, $subject, $message );
    }
    elseif( in_array( $userdata->user_role, array( 'editor', 'administrator' ) ) && $userdata->user_role != $old_user_data->user_role )
    {
        // We're updating the role of an existing user, make sure they're 
        // becoming an admin or editor, then send the message.
        wp_mail( $userdata->user_email, $subject, $message );
    }
}

    The above has not been tested. Copy and paste with caution. Just meant to get you started.