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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 | 
|---|---|
| 833 |      ); | 
| 834 |  | 
| 835 |      /** | 
| 836 |       * Filters the non-default cron schedules. | 
| 837 |       * | 
| 838 |       * @since 2.1.0 | 
| 839 |       * | 
| 840 |       * @param array $new_schedules An array of non-default cron schedules. Default empty. | 
| 841 |       */ | 
| 842 |      return array_merge( apply_filters( 'cron_schedules', array() ), $schedules ); | 
| 843 | } | 
| 844 |  | 
| 845 | /** | 
| 846 |  * Retrieve the recurrence schedule for an event. | 
| 847 |  * | 
| 848 |  * @see wp_get_schedules() for available schedules. | 
| 849 |  * | 
| 850 |  * @since 2.1.0 | 
| 851 |  * @since 5.1.0 {@see 'get_schedule'} filter added. |