[wp-trac] [WordPress Trac] #16781: is_wp_error() simplification

[WordPress Trac]

#16781: is_wp_error() simplification
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 Reporter:  hakre         |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  3.1
 Severity:  normal        |   Keywords:  has-patch
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 please review. see #2600, [3667],
 [http://php.net/manual/en/function.is-a.php is_a()],
 [http://www.php.net/manual/en/function.is-subclass-of.php
 is_subclass_of()]

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Ticket URL: <http://core.trac.wordpress.org/ticket/16781>
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