Joe McGill 170d22a22c Post Thumbnails: Add helper functions for attachment captions. ...

This adds three new functions for getting/displaying attachment captions:

* `wp_get_attachment_caption` - Retrieves a caption for a specific attachment.
* `get_the_post_thumbnail_caption()` - Returns the post thumbnail caption.
* `the_post_thumbnail_caption()` - Displays the post thumbnail caption.

These are helpful for displaying a caption associated with an image directly
in a template, rather than using the caption shortcode.

This also introduces two new filters:

* `wp_get_attachment_caption` - Filters the value of `wp_get_attachment_caption()`.
* `the_post_thumbnail_caption` - Filters the display of the post thumbnail caption.

`the_post_thumbnail_caption()` is automatically filtered by `wptexturize()`,
`convert_smilies()`, and `convert_chars()` in `wp-includes/default-filters.php`.

Props flixos90, joemcgill.
Fixes #12235.
Built from https://develop.svn.wordpress.org/trunk@37915


git-svn-id: http://core.svn.wordpress.org/trunk@37856 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-06-29 17:28:28 +00:00

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