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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 |
|---|---|
| 40 | $post_types = array_filter( $post_types, 'is_post_type_viewable' ); |
| 41 | |
| 42 | /** |
| 43 | * Filters the list of post object sub types available within the sitemap. |
| 44 | * |
| 45 | * @since 5.5.0 |
| 46 | * |
| 47 | * @param WP_Post_Type[] $post_types Array of registered post type objects keyed by their name. |
| 48 | */ |
| 49 | return apply_filters( 'wp_sitemaps_post_types', $post_types ); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Gets a URL list for a post type sitemap. |
| 54 | * |
| 55 | * @since 5.5.0 |
| 56 | * |
| 57 | * @param int $page_num Page of results. |
| 58 | * @param string $post_type Optional. Post type name. Default empty. |