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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 |
|---|---|
| 1008 | } |
| 1009 | |
| 1010 | /** |
| 1011 | * Filters the old slug redirect post ID. |
| 1012 | * |
| 1013 | * @since 4.9.3 |
| 1014 | * |
| 1015 | * @param int $id The redirect post ID. |
| 1016 | */ |
| 1017 | $id = apply_filters( 'old_slug_redirect_post_id', $id ); |
| 1018 | |
| 1019 | if ( ! $id ) { |
| 1020 | return; |
| 1021 | } |
| 1022 | |
| 1023 | $link = get_permalink( $id ); |
| 1024 | |
| 1025 | if ( get_query_var( 'paged' ) > 1 ) { |
| 1026 | $link = user_trailingslashit( trailingslashit( $link ) . 'page/' . get_query_var( 'paged' ) ); |