[wp-trac] [WordPress Trac] #25672: is_a() causing errors with get_users()

[WordPress Trac]

#25672: is_a() causing errors with get_users()
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 Reporter:  dgdax             |       Owner:
     Type:  defect (bug)      |      Status:  new
 Priority:  normal            |   Milestone:  Awaiting Review
Component:  Warnings/Notices  |     Version:  3.6.1
 Severity:  normal            |  Resolution:
 Keywords:  needs-patch       |
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Comment (by johnbillion):

 I believe `is_a()` is the preferred method due to errors that can arise
 with `instanceof` negation. Example:

 Correct:

 `if ( ! is_a( $user, 'WP_User' ) )`

 Incorrect, but not obviously so:

 `if ( ! $user instanceof 'WP_User' )`

 The correct syntax for negation when using `instanceof` is:

 `if ( ! ( $user instanceof 'WP_User' ) )`

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Ticket URL: <http://core.trac.wordpress.org/ticket/25672#comment:4>
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