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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 |
---|---|
1067 | } |
1068 |
|
1069 | /** |
1070 | * Filters the old slug redirect URL. |
1071 | * |
1072 | * @since 4.4.0 |
1073 | * |
1074 | * @param string $link The redirect URL. |
1075 | */ |
1076 | $link = apply_filters( 'old_slug_redirect_url', $link ); |
1077 |
|
1078 | if ( ! $link ) { |
1079 | return; |
1080 | } |
1081 |
|
1082 | wp_redirect( $link, 301 ); // Permanent redirect. |
1083 | exit; |
1084 | } |
1085 | } |