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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 |
|---|---|
| 49 | |
| 50 | /** |
| 51 | * Filters how often to update the RSS feed. |
| 52 | * |
| 53 | * @since 2.1.0 |
| 54 | * |
| 55 | * @param string $duration The update period. Accepts 'hourly', 'daily', 'weekly', 'monthly', |
| 56 | * 'yearly'. Default 'hourly'. |
| 57 | */ |
| 58 | echo apply_filters( 'rss_update_period', $duration ); |
| 59 | ?></sy:updatePeriod> |
| 60 | <sy:updateFrequency><?php |
| 61 | $frequency = '1'; |
| 62 | |
| 63 | /** |
| 64 | * Filters the RSS update frequency. |
| 65 | * |
| 66 | * @since 2.1.0 |
| 67 | * |