[wp-trac] [WordPress Trac] #56954: Add action or constant 'doing_sitemap'

[WordPress Trac]

#56954: Add action or constant 'doing_sitemap'
-------------------------+-----------------------------
 Reporter:  Cybr         |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Sitemaps     |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 At `WP_Sitemaps_Renderer::render_sitemap()` and
 `WP_Sitemaps_Renderer::render_index()`, all preliminary checks for proper
 sitemap display have been conducted.

 To verify we're on an actual sitemap output page, it'd be helpful to have
 a constant or function asserting we reached this state. Such as `define(
 'DOING_SITEMAP', true );`.

 A use case I'm facing is filtering posts in archives from visitors but not
 necessarily search engines.

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Ticket URL: <https://core.trac.wordpress.org/ticket/56954>
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