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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 |
|---|---|
| 1429 | * |
| 1430 | * @since 2.9.0 |
| 1431 | * @since 3.5.0 Added the `$post_id` parameter. |
| 1432 | * @since 4.6.0 Added the `$thumbnail_id` parameter. |
| 1433 | * |
| 1434 | * @param string $content Admin post thumbnail HTML markup. |
| 1435 | * @param int $post_id Post ID. |
| 1436 | * @param int $thumbnail_id Thumbnail ID. |
| 1437 | */ |
| 1438 | return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id ); |
| 1439 | } |
| 1440 | |
| 1441 | /** |
| 1442 | * Check to see if the post is currently being edited by another user. |
| 1443 | * |
| 1444 | * @since 2.5.0 |
| 1445 | * |
| 1446 | * @param int $post_id ID of the post to check for editing |
| 1447 | * @return integer False: not locked or locked by current user. Int: user ID of user with lock. |