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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 |
---|---|
1617 | * |
1618 | * @since 2.9.0 |
1619 | * @since 3.5.0 Added the `$post_id` parameter. |
1620 | * @since 4.6.0 Added the `$thumbnail_id` parameter. |
1621 | * |
1622 | * @param string $content Admin post thumbnail HTML markup. |
1623 | * @param int $post_id Post ID. |
1624 | * @param int|null $thumbnail_id Thumbnail attachment ID, or null if there isn't one. |
1625 | */ |
1626 | return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id ); |
1627 | } |
1628 |
|
1629 | /** |
1630 | * Determines whether the post is currently being edited by another user. |
1631 | * |
1632 | * @since 2.5.0 |
1633 | * |
1634 | * @param int|WP_Post $post ID or object of the post to check for editing. |
1635 | * @return int|false ID of the user with lock. False if the post does not exist, post is not locked, |