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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 |
|---|---|
| 44 | <link><?php (is_single()) ? the_permalink_rss() : bloginfo_rss("url") ?></link> |
| 45 | <description><?php bloginfo_rss("description") ?></description> |
| 46 | <lastBuildDate><?php echo mysql2date('r', get_lastcommentmodified('GMT')); ?></lastBuildDate> |
| 47 | <sy:updatePeriod><?php |
| 48 | /** This filter is documented in wp-includes/feed-rss2.php */ |
| 49 | echo apply_filters( 'rss_update_period', 'hourly' ); |
| 50 | ?></sy:updatePeriod> |
| 51 | <sy:updateFrequency><?php |
| 52 | /** This filter is documented in wp-includes/feed-rss2.php */ |
| 53 | echo apply_filters( 'rss_update_frequency', '1' ); |
| 54 | ?></sy:updateFrequency> |
| 55 | <?php |
| 56 | /** |
| 57 | * Fires at the end of the RSS2 comment feed header. |
| 58 | * |
| 59 | * @since 2.3.0 |
| 60 | */ |
| 61 | do_action( 'commentsrss2_head' ); |
| 62 | |