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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 |
|---|---|
| 35 | <?php /** This filter is documented in wp-includes/feed-rss2.php */ ?> |
| 36 | <sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency> |
| 37 | <sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase> |
| 38 | <?php |
| 39 | /** |
| 40 | * Fires at the end of the RDF feed header. |
| 41 | * |
| 42 | * @since 2.0.0 |
| 43 | */ |
| 44 | do_action( 'rdf_header' ); |
| 45 | ?> |
| 46 | <items> |
| 47 | <rdf:Seq> |
| 48 | <?php while (have_posts()): the_post(); ?> |
| 49 | <rdf:li rdf:resource="<?php the_permalink_rss() ?>"/> |
| 50 | <?php endwhile; ?> |
| 51 | </rdf:Seq> |
| 52 | </items> |
| 53 | </channel> |