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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 | 
|---|---|
| 458 |      } | 
| 459 |  | 
| 460 |      /** | 
| 461 |       * Filter whether the site has more than one author with published posts. | 
| 462 |       * | 
| 463 |       * @since 3.2.0 | 
| 464 |       * | 
| 465 |       * @param bool $is_multi_author Whether $is_multi_author should evaluate as true. | 
| 466 |       */ | 
| 467 |      return apply_filters( 'is_multi_author', (bool) $is_multi_author ); | 
| 468 | } | 
| 469 |  | 
| 470 | /** | 
| 471 |  * Helper function to clear the cache for number of authors. | 
| 472 |  * | 
| 473 |  * @private | 
| 474 |  */ | 
| 475 | function __clear_multi_author_cache() { | 
| 476 |      delete_transient( 'is_multi_author' ); |