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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 |
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61 | /** |
62 | * Filter the RSS update frequency. |
63 | * |
64 | * @since 2.1.0 |
65 | * |
66 | * @param string $frequency An integer passed as a string representing the frequency |
67 | * of RSS updates within the update period. Default '1'. |
68 | */ |
69 | ?> |
70 | <sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', $frequency ); ?></sy:updateFrequency> |
71 | <?php |
72 | /** |
73 | * Fires at the end of the RSS2 Feed Header. |
74 | * |
75 | * @since 2.0.0 |
76 | */ |
77 | do_action( 'rss2_head'); |
78 |
|
79 | while( have_posts()) : the_post(); |