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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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55 |
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56 | /** |
57 | * Filters how often to update the RSS feed. |
58 | * |
59 | * @since 2.1.0 |
60 | * |
61 | * @param string $duration The update period. Accepts 'hourly', 'daily', 'weekly', 'monthly', |
62 | * 'yearly'. Default 'hourly'. |
63 | */ |
64 | echo apply_filters( 'rss_update_period', $duration ); |
65 | ?> |
66 | </sy:updatePeriod> |
67 | <sy:updateFrequency> |
68 | <?php |
69 | $frequency = '1'; |
70 |
|
71 | /** |
72 | * Filters the RSS update frequency. |
73 | * |