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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 |
|---|---|
| 723 | /** |
| 724 | * Filters the feed type permalink. |
| 725 | * |
| 726 | * @since 1.5.0 |
| 727 | * |
| 728 | * @param string $output The feed permalink. |
| 729 | * @param string $feed The feed type. Possible values include 'rss2', 'atom', |
| 730 | * or an empty string for the default feed type. |
| 731 | */ |
| 732 | return apply_filters( 'feed_link', $output, $feed ); |
| 733 | } |
| 734 | |
| 735 | /** |
| 736 | * Retrieves the permalink for the post comments feed. |
| 737 | * |
| 738 | * @since 2.2.0 |
| 739 | * |
| 740 | * @param int $post_id Optional. Post ID. Default is the ID of the global `$post`. |
| 741 | * @param string $feed Optional. Feed type. Possible values include 'rss2', 'atom'. |