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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 |
|---|---|
| 70 | */ |
| 71 | echo apply_filters( 'rss_update_frequency', $frequency ); |
| 72 | ?></sy:updateFrequency> |
| 73 | <?php |
| 74 | /** |
| 75 | * Fires at the end of the RSS2 Feed Header. |
| 76 | * |
| 77 | * @since 2.0.0 |
| 78 | */ |
| 79 | do_action( 'rss2_head'); |
| 80 | |
| 81 | while( have_posts()) : the_post(); |
| 82 | ?> |
| 83 | <item> |
| 84 | <title><?php the_title_rss() ?></title> |
| 85 | <link><?php the_permalink_rss() ?></link> |
| 86 | <?php if ( get_comments_number() || comments_open() ) : ?> |
| 87 | <comments><?php comments_link_feed(); ?></comments> |
| 88 | <?php endif; ?> |