[wp-trac] [WordPress Trac] #9073: wp_insert_post_data should allow to modify categories and tags too

[WordPress Trac]

#9073: wp_insert_post_data should allow to modify categories and tags too
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 Reporter:  sirzooro     |        Owner:  anonymous
     Type:  enhancement  |       Status:  reopened 
 Priority:  normal       |    Milestone:  2.9      
Component:  General      |      Version:  2.7      
 Severity:  normal       |   Resolution:           
 Keywords:  needs-patch  |  
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Comment(by sirzooro):

 I want to check how many tags post have, when post is saved. If there will
 be too many (e.g. 15, when limit is set to 10), I would like to extra ones
 (in this case remove last 5). I cannot do this with wp_insert_post_data
 filter - it allows to count tags, but does not allow to modify them. The
 same applies for categories and custom taxonomies too.

 I know that it is possible to modify $_POST array directly (e.g. in init
 hook, or even earlier), but this approach is a bit tricky. So I would like
 to see easier method.

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Ticket URL: <http://core.trac.wordpress.org/ticket/9073#comment:7>
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