Alter visibility of some properties in wpdb:

`num_queries` is accessed publicly in core.
`num_rows` is accessed publicly in `ms-settings.php`.
`insert_id` is accessed publicly in core.
`prefix` is accessed publicly in `upgrade.php` and `capabilities.php`.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32640 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/wp-db.php

@@ -84,19 +84,19 @@ class wpdb {
 	 * Amount of queries made
 	 *
 	 * @since 1.2.0
-	 * @access private
+	 * @access public
 	 * @var int
 	 */
-	var $num_queries = 0;
+	public $num_queries = 0;
 
 	/**
 	 * Count of rows returned by previous query
 	 *
 	 * @since 0.71
-	 * @access private
+	 * @access public
 	 * @var int
 	 */
-	var $num_rows = 0;
+	public $num_rows = 0;
 
 	/**
 	 * Count of affected rows by previous query
@@ -114,7 +114,7 @@ class wpdb {
 	 * @access public
 	 * @var int
 	 */
-	var $insert_id = 0;
+	public $insert_id = 0;
 
 	/**
 	 * Last query made
@@ -216,10 +216,10 @@ class wpdb {
 	 * security precautions.
 	 *
 	 * @since 2.5.0
-	 * @access private
+	 * @access public
 	 * @var string
 	 */
-	var $prefix = '';
+	public $prefix = '';
 
 	/**
 	 * WordPress base table prefix.