Ticket #37218: 37218.4.diff

src/wp-includes/functions.php

@@ -4350 +4350 @@
  *
  * @since 4.3.0
  *
- * @global wpdb $wpdb WordPress database abstraction object.
- *
  * @return int The ID of the main network.
  */
 function get_main_network_id() {
-        global $wpdb;
 
         if ( ! is_multisite() ) {
                 return 1;
@@ -4369 +4366 @@
                 // If the current network has an ID of 1, assume it is the main network.
                 $main_network_id = 1;
         } else {
-                $main_network_id = wp_cache_get( 'primary_network_id', 'site-options' );
-
-                if ( false === $main_network_id ) {
-                        $main_network_id = (int) $wpdb->get_var( "SELECT id FROM {$wpdb->site} ORDER BY id LIMIT 1" );
-                        wp_cache_add( 'primary_network_id', $main_network_id, 'site-options' );
-                }
+                $_networks = get_networks( array( 'fields' => 'ids', 'number' => 1 ) );
+                $main_network_id = array_shift( $_networks );
         }
 
         /**