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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 |
|---|---|
| 2399 | $post_id = (int) $post_id; |
| 2400 | if ( !$post =& get_post( $post_id ) ) |
| 2401 | return false; |
| 2402 | |
| 2403 | $url = get_the_guid( $post->ID ); |
| 2404 | |
| 2405 | if ( 'attachment' != $post->post_type || !$url ) |
| 2406 | return false; |
| 2407 | |
| 2408 | return apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 2409 | } |
| 2410 | |
| 2411 | /** |
| 2412 | * wp_get_attachment_thumb_file() - Retrieve thumbnail for an attachment |
| 2413 | * |
| 2414 | * {@internal Missing Long Description}} |
| 2415 | * |
| 2416 | * @package WordPress |
| 2417 | * @subpackage Post |