[wp-trac] [WordPress Trac] #33545: Check for existence of pagenow global

[WordPress Trac]

#33545: Check for existence of pagenow global
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 Reporter:  KalenJohnson    |      Owner:
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Bootstrap/Load  |    Version:  4.3
 Severity:  normal          |   Keywords:
  Focuses:  template        |
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 There are some plugins that call `home_url()` or `get_home_url()` without
 being in any type of hook, so it's happening right when the plugin get's
 loaded. It doesn't seem like this is always an issue, but I am seeing many
 warnings of an undefined index.

 This patch I don't believe will break anything, since if things are being
 loaded before the `$pagenow` global exists, this check won't work anyways,
 so checking for it and removing a PHP warning seems like a win.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33545>
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