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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 |
|---|---|
| 1571 | * |
| 1572 | * @since 2.9.0 |
| 1573 | * @since 3.5.0 Added the `$post_id` parameter. |
| 1574 | * @since 4.6.0 Added the `$thumbnail_id` parameter. |
| 1575 | * |
| 1576 | * @param string $content Admin post thumbnail HTML markup. |
| 1577 | * @param int $post_id Post ID. |
| 1578 | * @param int|null $thumbnail_id Thumbnail attachment ID, or null if there isn't one. |
| 1579 | */ |
| 1580 | return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id ); |
| 1581 | } |
| 1582 | |
| 1583 | /** |
| 1584 | * Check to see if the post is currently being edited by another user. |
| 1585 | * |
| 1586 | * @since 2.5.0 |
| 1587 | * |
| 1588 | * @param int|WP_Post $post_id ID or object of the post to check for editing. |
| 1589 | * @return int|false ID of the user with lock. False if the post does not exist, post is not locked, |