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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 | 
|---|---|
| 594 |       * @since 2.7.0 | 
| 595 |       * @since 4.1.0 Added `$post_type` argument. | 
| 596 |       * @since 4.3.1 Added `$public_only` argument. | 
| 597 |       * | 
| 598 |       * @param int          $count       The user's post count. | 
| 599 |       * @param int          $userid      User ID. | 
| 600 |       * @param string|array $post_type   Single post type or array of post types to count the number of posts for. | 
| 601 |       * @param bool         $public_only Whether to limit counted posts to public posts. | 
| 602 |       */ | 
| 603 |      return apply_filters( 'get_usernumposts', $count, $userid, $post_type, $public_only ); | 
| 604 | } | 
| 605 |  | 
| 606 | /** | 
| 607 |  * Gets the number of posts written by a list of users. | 
| 608 |  * | 
| 609 |  * @since 3.0.0 | 
| 610 |  * | 
| 611 |  * @global wpdb $wpdb WordPress database abstraction object. | 
| 612 |  * |