Ticket #12459: 12459.2.diff

wp-includes/ms-functions.php

@@ -49 +49 @@
                 return false;
 
         $blogs = $match = array();
+        $prefix_length = strlen($wpdb->base_prefix);
         foreach ( (array) $user as $key => $value ) {
-                if ( false !== strpos( $key, '_capabilities') && 0 === strpos( $key, $wpdb->base_prefix ) && preg_match( '/' . $wpdb->base_prefix . '((\d+)_)?capabilities/', $key, $match ) ) {
+                if ( $prefix_length && substr($key, 0, $prefix_length) != $wpdb->base_prefix )
+                        continue;
+                if ( substr($key, -12, 12) != 'capabilities' )
+                        continue;
+                if ( preg_match( '/' . $wpdb->base_prefix . '((\d+)_)?capabilities/', $key, $match ) ) {
                         if ( count( $match ) > 2 )
                                 $blog_id = $match[ 2 ];
                         else