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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 |
---|---|
42 | * |
43 | * Passing a non-null value will effectively short-circuit the generation, |
44 | * returning that value instead. |
45 | * |
46 | * @since 5.5.0 |
47 | * |
48 | * @param array $url_list The URL list. Default null. |
49 | * @param int $page_num Page of results. |
50 | */ |
51 | $url_list = apply_filters( |
52 | 'wp_sitemaps_users_pre_url_list', |
53 | null, |
54 | $page_num |
55 | ); |
56 |
|
57 | if ( null !== $url_list ) { |
58 | return $url_list; |
59 | } |
60 |
|