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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 |
|---|---|
| 59 | /** This filter is documented in wp-includes/feed-rss2.php */ |
| 60 | echo apply_filters( 'rss_update_frequency', '1' ); |
| 61 | ?></sy:updateFrequency> |
| 62 | <?php |
| 63 | /** |
| 64 | * Fires at the end of the RSS2 comment feed header. |
| 65 | * |
| 66 | * @since 2.3.0 |
| 67 | */ |
| 68 | do_action( 'commentsrss2_head' ); |
| 69 | |
| 70 | if ( have_comments() ) : while ( have_comments() ) : the_comment(); |
| 71 | $comment_post = $GLOBALS['post'] = get_post( $comment->comment_post_ID ); |
| 72 | ?> |
| 73 | <item> |
| 74 | <title><?php |
| 75 | if ( !is_singular() ) { |
| 76 | $title = get_the_title($comment_post->ID); |
| 77 | /** This filter is documented in wp-includes/feed.php */ |