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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 |
|---|---|
| 596 | |
| 597 | /** |
| 598 | * Filter the feed type permalink. |
| 599 | * |
| 600 | * @since 1.5.0 |
| 601 | * |
| 602 | * @param string $output The feed permalink. |
| 603 | * @param string $feed Feed type. |
| 604 | */ |
| 605 | return apply_filters( 'feed_link', $output, $feed ); |
| 606 | } |
| 607 | |
| 608 | /** |
| 609 | * Retrieve the permalink for the post comments feed. |
| 610 | * |
| 611 | * @since 2.2.0 |
| 612 | * |
| 613 | * @param int $post_id Optional. Post ID. |
| 614 | * @param string $feed Optional. Feed type. |