[wp-trac] [WordPress Trac] #30647: wp_update_user() allows using existing user_email, user_login, and user_nicename

[WordPress Trac]

#30647: wp_update_user() allows using existing user_email, user_login, and
user_nicename
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 Reporter:  danielbachhuber         |       Owner:
     Type:  defect (bug)            |      Status:  new
 Priority:  normal                  |   Milestone:  4.2
Component:  Users                   |     Version:  2.9.2
 Severity:  normal                  |  Resolution:
 Keywords:  dev-feedback has-patch  |     Focuses:
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Comment (by SergeyBiryukov):

 Replying to [comment:1 danielbachhuber]:
 > It would be nice to have a `nicename_exists()` function, similar to
 `username_exists()`

 Related: #31106

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Ticket URL: <https://core.trac.wordpress.org/ticket/30647#comment:7>
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