[wp-trac] [WordPress Trac] #28461: Add a fallback parameter to get_the_post_thumbnail() to find images

[WordPress Trac]

#28461: Add a fallback parameter to get_the_post_thumbnail() to find images
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 Reporter:  krogsgard        |       Owner:
     Type:  enhancement      |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Post Thumbnails  |     Version:  3.9
 Severity:  normal           |  Resolution:
 Keywords:  needs-patch      |     Focuses:  template
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Comment (by flixos90):

 This appears to be rather plugin territory to me.

 What would be useful however to make this possible in a plugin is that we
 could add a new filter `get_post_thumbnail_id` inside the function of the
 same name. This would allow to override the post thumbnail - not actually
 setting it though, but it would allow to add a fallback in the frontend.
 We could also limit this filter to only be executed if there is no actual
 featured image for that post.

 To have this filter only be run in the frontend, we could add an
 additional parameter `$filtered` with default `true` and explicitly set it
 to `false` wherever calling it from the admin. Alternatively we could not
 use the function at all in the admin - it is only used in one location
 there anyway (most areas access the post meta directly), so we're a bit
 inconsistent atm.

 @krogsgard: Thoughts on this?

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Ticket URL: <https://core.trac.wordpress.org/ticket/28461#comment:5>
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