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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 |
|---|---|
| 371 | if ( empty($feed) ) |
| 372 | $feed = get_default_feed(); |
| 373 | |
| 374 | if ( false !== strpos($feed, 'comments_') ) |
| 375 | $feed = str_replace('comments_', 'comments-', $feed); |
| 376 | |
| 377 | $output = get_option('home') . "/?feed={$feed}"; |
| 378 | } |
| 379 | |
| 380 | return apply_filters('feed_link', $output, $feed); |
| 381 | } |
| 382 | |
| 383 | /** |
| 384 | * Retrieve the permalink for the post comments feed. |
| 385 | * |
| 386 | * @since 2.2.0 |
| 387 | * |
| 388 | * @param int $post_id Optional. Post ID. |
| 389 | * @param string $feed Optional. Feed type. |