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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 |
---|---|
37 | $date = get_lastpostmodified( 'GMT' ); |
38 | echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date ) : date( 'Y-m-d\TH:i:s\Z' ); |
39 | ?></dc:date> |
40 | <sy:updatePeriod><?php |
41 | /** This filter is documented in wp-includes/feed-rss2.php */ |
42 | echo apply_filters( 'rss_update_period', 'hourly' ); |
43 | ?></sy:updatePeriod> |
44 | <sy:updateFrequency><?php |
45 | /** This filter is documented in wp-includes/feed-rss2.php */ |
46 | echo apply_filters( 'rss_update_frequency', '1' ); |
47 | ?></sy:updateFrequency> |
48 | <sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase> |
49 | <?php |
50 | /** |
51 | * Fires at the end of the RDF feed header. |
52 | * |
53 | * @since 2.0.0 |
54 | */ |
55 | do_action( 'rdf_header' ); |