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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 |
|---|---|
| 72 | * Passing a non-null value will effectively short-circuit the generation, |
| 73 | * returning that value instead. |
| 74 | * |
| 75 | * @since 5.5.0 |
| 76 | * |
| 77 | * @param array $url_list The URL list. Default null. |
| 78 | * @param string $post_type Post type name. |
| 79 | * @param int $page_num Page of results. |
| 80 | */ |
| 81 | $url_list = apply_filters( |
| 82 | 'wp_sitemaps_posts_pre_url_list', |
| 83 | null, |
| 84 | $post_type, |
| 85 | $page_num |
| 86 | ); |
| 87 | |
| 88 | if ( null !== $url_list ) { |
| 89 | return $url_list; |
| 90 | } |