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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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39 | /** |
40 | * Filter how often to update the RSS feed. |
41 | * |
42 | * @since 2.1.0 |
43 | * |
44 | * @param string $duration The update period. |
45 | * Default 'hourly'. Accepts 'hourly', 'daily', 'weekly', 'monthly', 'yearly'. |
46 | */ |
47 | ?> |
48 | <sy:updatePeriod><?php echo apply_filters( 'rss_update_period', $duration ); ?></sy:updatePeriod> |
49 | <?php |
50 | $frequency = '1'; |
51 | /** |
52 | * Filter the RSS update frequency. |
53 | * |
54 | * @since 2.1.0 |
55 | * |
56 | * @param string $frequency An integer passed as a string representing the frequency |
57 | * of RSS updates within the update period. Default '1'. |