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