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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 |
|---|---|
| 1105 | } |
| 1106 | |
| 1107 | /** |
| 1108 | * Filters the old slug redirect URL. |
| 1109 | * |
| 1110 | * @since 4.4.0 |
| 1111 | * |
| 1112 | * @param string $link The redirect URL. |
| 1113 | */ |
| 1114 | $link = apply_filters( 'old_slug_redirect_url', $link ); |
| 1115 | |
| 1116 | if ( ! $link ) { |
| 1117 | return; |
| 1118 | } |
| 1119 | |
| 1120 | wp_redirect( $link, 301 ); // Permanent redirect. |
| 1121 | exit; |
| 1122 | } |
| 1123 | } |