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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 |
|---|---|
| 29 | /** |
| 30 | * Filters whether a post has a post thumbnail. |
| 31 | * |
| 32 | * @since 5.1.0 |
| 33 | * |
| 34 | * @param bool $has_thumbnail true if the post has a post thumbnail, otherwise false. |
| 35 | * @param int|WP_Post|null $post Post ID or WP_Post object. Default is global `$post`. |
| 36 | * @param int|string $thumbnail_id Post thumbnail ID or empty string. |
| 37 | */ |
| 38 | return (bool) apply_filters( 'has_post_thumbnail', $has_thumbnail, $post, $thumbnail_id ); |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Retrieve post thumbnail ID. |
| 43 | * |
| 44 | * @since 2.9.0 |
| 45 | * @since 4.4.0 `$post` can be a post ID or WP_Post object. |
| 46 | * @since 5.5.0 The return value for a non-existing post |
| 47 | * was changed to false instead of an empty string. |