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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 |
|---|---|
| 2424 | $post_id = (int) $post_id; |
| 2425 | if ( !$post =& get_post( $post_id ) ) |
| 2426 | return false; |
| 2427 | if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) ) |
| 2428 | return false; |
| 2429 | |
| 2430 | $file = get_attached_file( $post->ID ); |
| 2431 | |
| 2432 | if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) |
| 2433 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 2434 | return false; |
| 2435 | } |
| 2436 | |
| 2437 | /** |
| 2438 | * wp_get_attachment_thumb_url() - Retrieve URL for an attachment thumbnail |
| 2439 | * |
| 2440 | * {@internal Missing Long Description}} |
| 2441 | * |
| 2442 | * @package WordPress |