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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 |
---|---|
902 | } |
903 |
|
904 | /** |
905 | * Filters the old slug redirect URL. |
906 | * |
907 | * @since 4.4.0 |
908 | * |
909 | * @param string $link The redirect URL. |
910 | */ |
911 | $link = apply_filters( 'old_slug_redirect_url', $link ); |
912 |
|
913 | if ( ! $link ) { |
914 | return; |
915 | } |
916 |
|
917 | wp_redirect( $link, 301 ); // Permanent redirect |
918 | exit; |
919 | } |
920 | } |