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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 |
---|---|
1046 | } |
1047 |
|
1048 | /** |
1049 | * Filters the old slug redirect post ID. |
1050 | * |
1051 | * @since 4.9.3 |
1052 | * |
1053 | * @param int $id The redirect post ID. |
1054 | */ |
1055 | $id = apply_filters( 'old_slug_redirect_post_id', $id ); |
1056 |
|
1057 | if ( ! $id ) { |
1058 | return; |
1059 | } |
1060 |
|
1061 | $link = get_permalink( $id ); |
1062 |
|
1063 | if ( get_query_var( 'paged' ) > 1 ) { |
1064 | $link = user_trailingslashit( trailingslashit( $link ) . 'page/' . get_query_var( 'paged' ) ); |