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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 |
|---|---|
| 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'. |