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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2294 | $post_id = (int) $post_id; |
| 2295 | if ( !$post =& get_post( $post_id ) ) |
| 2296 | return false; |
| 2297 | if ( !$imagedata = wp_get_attachment_metadata( $post->ID ) ) |
| 2298 | return false; |
| 2299 | |
| 2300 | $file = get_attached_file( $post->ID ); |
| 2301 | |
| 2302 | if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) |
| 2303 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 2304 | return false; |
| 2305 | } |
| 2306 | |
| 2307 | /** |
| 2308 | * wp_get_attachment_thumb_url() - Retrieve URL for an attachment thumbnail |
| 2309 | * |
| 2310 | * {@internal Missing Long Description}} |
| 2311 | * |
| 2312 | * @package WordPress |