[wp-trac] [WordPress Trac] #59000: Add a check for wp_get_current_user to current_user_can

[WordPress Trac]

#59000: Add a check for wp_get_current_user to current_user_can
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 Reporter:  scruffian     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 This issue was raised in
 https://github.com/WordPress/gutenberg/issues/53284, but I think its
 exposing an issue with WordPress more generally.

 It's possible to call `current_user_can` before `wp_get_current_user` has
 been defined, but we don't have any checks for `wp_get_current_user`
 inside `current_user_can`. I think we should check whether the function
 exists before we attempt to call it to avoid fatal errors that are
 possible as shown by https://github.com/WordPress/gutenberg/issues/53284.

 I have a potential fix here: https://github.com/WordPress/wordpress-
 develop/pull/4959, but I'm open to other suggestions.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59000>
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