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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 |
|---|---|
| 612 | |
| 613 | /** |
| 614 | * Filters the feed type permalink. |
| 615 | * |
| 616 | * @since 1.5.0 |
| 617 | * |
| 618 | * @param string $output The feed permalink. |
| 619 | * @param string $feed Feed type. |
| 620 | */ |
| 621 | return apply_filters( 'feed_link', $output, $feed ); |
| 622 | } |
| 623 | |
| 624 | /** |
| 625 | * Retrieves the permalink for the post comments feed. |
| 626 | * |
| 627 | * @since 2.2.0 |
| 628 | * |
| 629 | * @param int $post_id Optional. Post ID. Default is the ID of the global `$post`. |
| 630 | * @param string $feed Optional. Feed type. Default empty. |