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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 |
|---|---|
| 61 | |
| 62 | /** |
| 63 | * Filters post thumbnail ID. |
| 64 | * |
| 65 | * @since 5.9.0 |
| 66 | * |
| 67 | * @param int|false $thumbnail_id Post thumbnail ID or false if the post does not exist. |
| 68 | * @param int|WP_Post|null $post Post ID or WP_Post object. Default is global `$post`. |
| 69 | */ |
| 70 | return (int) apply_filters( 'post_thumbnail_id', $thumbnail_id, $post ); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Display the post thumbnail. |
| 75 | * |
| 76 | * When a theme adds 'post-thumbnail' support, a special 'post-thumbnail' image size |
| 77 | * is registered, which differs from the 'thumbnail' image size managed via the |
| 78 | * Settings > Media screen. |
| 79 | * |