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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 |
|---|---|
| 6717 | |
| 6718 | /** |
| 6719 | * Filters the attachment thumbnail URL. |
| 6720 | * |
| 6721 | * @since 2.1.0 |
| 6722 | * |
| 6723 | * @param string $thumbnail_url URL for the attachment thumbnail. |
| 6724 | * @param int $post_id Attachment ID. |
| 6725 | */ |
| 6726 | return apply_filters( 'wp_get_attachment_thumb_url', $thumbnail_url, $post_id ); |
| 6727 | } |
| 6728 | |
| 6729 | /** |
| 6730 | * Verifies an attachment is of a given type. |
| 6731 | * |
| 6732 | * @since 4.2.0 |
| 6733 | * |
| 6734 | * @param string $type Attachment type. Accepts `image`, `audio`, `video`, or a file extension. |
| 6735 | * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post. |