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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 |
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978 | } |
979 |
|
980 | /** |
981 | * Filters the old slug redirect post ID. |
982 | * |
983 | * @since 4.9.3 |
984 | * |
985 | * @param int $id The redirect post ID. |
986 | */ |
987 | $id = apply_filters( 'old_slug_redirect_post_id', $id ); |
988 |
|
989 | if ( ! $id ) { |
990 | return; |
991 | } |
992 |
|
993 | $link = get_permalink( $id ); |
994 |
|
995 | if ( get_query_var( 'paged' ) > 1 ) { |
996 | $link = user_trailingslashit( trailingslashit( $link ) . 'page/' . get_query_var( 'paged' ) ); |