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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 | 
|---|---|
| 150 |  * @return int Amount of posts user has written. | 
| 151 |  */ | 
| 152 | function count_user_posts($userid) { | 
| 153 |      global $wpdb; | 
| 154 |  | 
| 155 |      $where = get_posts_by_author_sql('post', true, $userid); | 
| 156 |  | 
| 157 |      $count = $wpdb->get_var( "SELECT COUNT(*) FROM $wpdb->posts $where" ); | 
| 158 |  | 
| 159 |      return apply_filters('get_usernumposts', $count, $userid); | 
| 160 | } | 
| 161 |  | 
| 162 | /** | 
| 163 |  * Number of posts written by a list of users. | 
| 164 |  * | 
| 165 |  * @since 3.0.0 | 
| 166 |  * | 
| 167 |  * @param array $users Array of user IDs. | 
| 168 |  * @param string $post_type Optional. Post type to check. Defaults to post. |