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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 | 
|---|---|
| 527 |      } | 
| 528 |  | 
| 529 |      /** | 
| 530 |       * Filters whether the site has more than one author with published posts. | 
| 531 |       * | 
| 532 |       * @since 3.2.0 | 
| 533 |       * | 
| 534 |       * @param bool $is_multi_author Whether $is_multi_author should evaluate as true. | 
| 535 |       */ | 
| 536 |      return apply_filters( 'is_multi_author', (bool) $is_multi_author ); | 
| 537 | } | 
| 538 |  | 
| 539 | /** | 
| 540 |  * Helper function to clear the cache for number of authors. | 
| 541 |  * | 
| 542 |  * @since 3.2.0 | 
| 543 |  * @access private | 
| 544 |  */ | 
| 545 | function __clear_multi_author_cache() { |