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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 |
|---|---|
| 642 | |
| 643 | /** |
| 644 | * Filters the feed type permalink. |
| 645 | * |
| 646 | * @since 1.5.0 |
| 647 | * |
| 648 | * @param string $output The feed permalink. |
| 649 | * @param string $feed Feed type. |
| 650 | */ |
| 651 | return apply_filters( 'feed_link', $output, $feed ); |
| 652 | } |
| 653 | |
| 654 | /** |
| 655 | * Retrieves the permalink for the post comments feed. |
| 656 | * |
| 657 | * @since 2.2.0 |
| 658 | * |
| 659 | * @param int $post_id Optional. Post ID. Default is the ID of the global `$post`. |
| 660 | * @param string $feed Optional. Feed type. Default empty. |