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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 |
|---|---|
| 18 | xmlns:content="http://purl.org/rss/1.0/modules/content/" |
| 19 | <?php do_action('rdf_ns'); ?> |
| 20 | > |
| 21 | <channel rdf:about="<?php bloginfo_rss("url") ?>"> |
| 22 | <title><?php bloginfo_rss('name'); wp_title_rss(); ?></title> |
| 23 | <link><?php bloginfo_rss('url') ?></link> |
| 24 | <description><?php bloginfo_rss('description') ?></description> |
| 25 | <dc:date><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_lastpostmodified('GMT'), false); ?></dc:date> |
| 26 | <sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod> |
| 27 | <sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency> |
| 28 | <sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase> |
| 29 | <?php do_action('rdf_header'); ?> |
| 30 | <items> |
| 31 | <rdf:Seq> |
| 32 | <?php while (have_posts()): the_post(); ?> |
| 33 | <rdf:li rdf:resource="<?php the_permalink_rss() ?>"/> |
| 34 | <?php endwhile; ?> |
| 35 | </rdf:Seq> |
| 36 | </items> |