[wp-trac] [WordPress Trac] #14805: PHP warning in edit_user() during email check for new user

WordPress Trac wp-trac at lists.automattic.com
Tue Sep 7 16:09:53 UTC 2010

#14805: PHP warning in edit_user() during email check for new user
 Reporter:  coffee2code       |       Owner:                 
     Type:  defect (bug)      |      Status:  new            
 Priority:  normal            |   Milestone:  Awaiting Review
Component:  Warnings/Notices  |     Version:  3.0.1          
 Severity:  minor             |    Keywords:  has-patch      
 In `edit_user()` (in wp-admin/includes/user.php), there is this line:

 ` elseif ( ( $owner_id = email_exists($user->user_email) ) && $owner_id !=
 $user->ID )`

 Essentially, it's saying "if this email exists and the owner of that email
 isn't the user being edited".  The problem is that `edit_user()` is also
 used when creating a user.  At the top of the function you'll find this:

         if ( $user_id != 0 ) {
                 $update = true;
                 $user->ID = (int) $user_id;
                 $userdata = get_userdata( $user_id );
                 $user->user_login = $wpdb->escape( $userdata->user_login
         } else {
                 $update = false;
                 $user = '';

 `$user->ID` only gets set if a user is being updated and not when one is
 being created.  A new user doesn't receive an ID until the very end of the
 function as a result of a call to `wp_insert_user()`.  So that first bit
 of code can generate a PHP warning.  In practice I believe the normal flow
 of WP has a separate, earlier `email_exists()` check elsewhere preventing
 this function from being called (and thus the warning not often tripped).
 However, I don't believe that should be relied upon in the event the
 workflow changes (or a plugin calls `edit_user()` directly).  (Other
 monkeying by plugins can get there as well, which is how I think I tripped

 Besides, the fix is very minor and logically straightforward.  Basically,
 check if email_exists and that it's either a new user or an existing user
 who doesn't already have that email.

Ticket URL: <http://core.trac.wordpress.org/ticket/14805>
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