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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 |
|---|---|
| 444 | if ( empty($feed) ) |
| 445 | $feed = get_default_feed(); |
| 446 | |
| 447 | if ( false !== strpos($feed, 'comments_') ) |
| 448 | $feed = str_replace('comments_', 'comments-', $feed); |
| 449 | |
| 450 | $output = home_url("?feed={$feed}"); |
| 451 | } |
| 452 | |
| 453 | return apply_filters('feed_link', $output, $feed); |
| 454 | } |
| 455 | |
| 456 | /** |
| 457 | * Retrieve the permalink for the post comments feed. |
| 458 | * |
| 459 | * @since 2.2.0 |
| 460 | * |
| 461 | * @param int $post_id Optional. Post ID. |
| 462 | * @param string $feed Optional. Feed type. |