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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 |
---|---|
58 | <sy:updatePeriod> |
59 | <?php |
60 | /** This filter is documented in wp-includes/feed-rss2.php */ |
61 | echo apply_filters( 'rss_update_period', 'hourly' ); |
62 | ?> |
63 | </sy:updatePeriod> |
64 | <sy:updateFrequency> |
65 | <?php |
66 | /** This filter is documented in wp-includes/feed-rss2.php */ |
67 | echo apply_filters( 'rss_update_frequency', '1' ); |
68 | ?> |
69 | </sy:updateFrequency> |
70 | <?php |
71 | /** |
72 | * Fires at the end of the RSS2 comment feed header. |
73 | * |
74 | * @since 2.3.0 |
75 | */ |
76 | do_action( 'commentsrss2_head' ); |