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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 | 
|---|---|
| 687 |           if ( $this->role ) { | 
| 688 |                $this->query_from .= " INNER JOIN $wpdb->usermeta ON $wpdb->users.ID = $wpdb->usermeta.user_id"; | 
| 689 |                $this->query_where .= $wpdb->prepare(" AND $wpdb->usermeta.meta_key = '{$wpdb->prefix}capabilities' AND $wpdb->usermeta.meta_value LIKE %s", '%' . $this->role . '%'); | 
| 690 |           } elseif ( is_multisite() ) { | 
| 691 |                $level_key = $wpdb->prefix . 'capabilities'; // wpmu site admins don't have user_levels | 
| 692 |                $this->query_from .= ", $wpdb->usermeta"; | 
| 693 |                $this->query_where .= " AND $wpdb->users.ID = $wpdb->usermeta.user_id AND meta_key = '{$level_key}'"; | 
| 694 |           } | 
| 695 |  | 
| 696 |           do_action_ref_array( 'pre_user_search', array( &$this ) ); | 
| 697 |      } | 
| 698 |  | 
| 699 |      /** | 
| 700 |       * {@internal Missing Short Description}} | 
| 701 |       * | 
| 702 |       * {@internal Missing Long Description}} | 
| 703 |       * | 
| 704 |       * @since unknown | 
| 705 |       * @access public |