[wp-trac] [WordPress Trac] #9227: in get_the_category_list(), filter categories before constructing list

[WordPress Trac]

#9227: in get_the_category_list(), filter categories before constructing list
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 Reporter:  KevinB       |       Owner:  wonderboymusic
     Type:  enhancement  |      Status:  assigned
 Priority:  normal       |   Milestone:  4.4
Component:  Taxonomy     |     Version:  2.8
 Severity:  normal       |  Resolution:
 Keywords:  has-patch    |     Focuses:  template
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Changes (by boonebgorges):

 * keywords:  has-patch 2nd-opinion => has-patch
 * milestone:  Future Release => 4.4


Comment:

 Replying to [comment:22 SergeyBiryukov]:
 > 1. In [attachment:9227.4.diff], `$categories` should be an array rather
 than array|bool, because [source:tags/3.9.1/src/wp-includes/category-
 template.php#L65 get_the_category()] always returns an array. The docs
 need to be adjusted as well.
 > 2. [source:tags/3.9.1/src/wp-includes/category-template.php#L85
 get_the_categories] filter was added in [16332]. Is there a use case that
 cannot be achieved using that filter? You can conditionally apply it on
 front-end as needed. We don't pass the post ID there, perhaps we should do
 that instead of introducing a new filter.

 `get_the_category()` is also used in `get_permalink()`. This is a very
 different context from using `get_the_category()` to get categories for
 display. So I'd say that it's worth having a separate filter, though
 passing the post ID to 'get_the_categories' is also a dynamite idea.

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Ticket URL: <https://core.trac.wordpress.org/ticket/9227#comment:25>
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