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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 |
|---|---|
| 34 | <link><?php bloginfo_rss('url') ?></link> |
| 35 | <description><?php bloginfo_rss('description') ?></description> |
| 36 | <dc:date><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_lastpostmodified('GMT'), false); ?></dc:date> |
| 37 | <sy:updatePeriod><?php |
| 38 | /** This filter is documented in wp-includes/feed-rss2.php */ |
| 39 | echo apply_filters( 'rss_update_period', 'hourly' ); |
| 40 | ?></sy:updatePeriod> |
| 41 | <sy:updateFrequency><?php |
| 42 | /** This filter is documented in wp-includes/feed-rss2.php */ |
| 43 | echo apply_filters( 'rss_update_frequency', '1' ); |
| 44 | ?></sy:updateFrequency> |
| 45 | <sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase> |
| 46 | <?php |
| 47 | /** |
| 48 | * Fires at the end of the RDF feed header. |
| 49 | * |
| 50 | * @since 2.0.0 |
| 51 | */ |
| 52 | do_action( 'rdf_header' ); |