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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 |
|---|---|
| 51 | $date = get_lastcommentmodified( 'GMT' ); |
| 52 | echo $date ? mysql2date( 'r', $date, false ) : date( 'r' ); |
| 53 | ?></lastBuildDate> |
| 54 | <sy:updatePeriod><?php |
| 55 | /** This filter is documented in wp-includes/feed-rss2.php */ |
| 56 | echo apply_filters( 'rss_update_period', 'hourly' ); |
| 57 | ?></sy:updatePeriod> |
| 58 | <sy:updateFrequency><?php |
| 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 | |