Need set_post_type API

[filosofo]

Currently there is a get_post_type function, which with other functions allows plugins to use custom "post_type"s. There should be API to set the post_type without having to access the db directly.

[filosofo]

The second patch sanitizes post_type per rboren's suggestion at comment:ticket:4991:1

[ryan]

I think this needs to use wp_update_post() so that all of the right actions are triggered.

[filosofo]

Replying to ryan:

I think this needs to use wp_update_post() so that all of the right actions are triggered.

One advantage to a stand-alone function instead of just using wp_update_post() is that you don't have to know all of the post data first.

Also, other aspects of a post can be changed without going through wp_update_post, such as categories, tags, ping URLs, and post meta-data.

And you keep the API parallel: where there's a get_* there should be a set_* or update_*

[ryan]

(In [6537]) set_post_type from filosofo. fixes #4844

[ryan]

I added db prepare and some phpdoc, hopefully didn't break anything.