--- a/wp/wp-admin/network/upgrade.php	Mon Jun 08 16:11:51 2015 +0000
+++ b/wp/wp-admin/network/upgrade.php	Tue Jun 09 03:35:32 2015 +0200
@@ -29,17 +29,16 @@
 
 get_current_screen()->set_help_sidebar(
 	'<p><strong>' . __('For more information:') . '</strong></p>' .
-	'<p>' . __('<a href="http://codex.wordpress.org/Network_Admin_Updates_Screen" target="_blank">Documentation on Upgrade Network</a>') . '</p>' .
-	'<p>' . __('<a href="http://wordpress.org/support/" target="_blank">Support Forums</a>') . '</p>'
+	'<p>' . __('<a href="https://codex.wordpress.org/Network_Admin_Updates_Screen" target="_blank">Documentation on Upgrade Network</a>') . '</p>' .
+	'<p>' . __('<a href="https://wordpress.org/support/" target="_blank">Support Forums</a>') . '</p>'
 );
 
 require_once( ABSPATH . 'wp-admin/admin-header.php' );
 
 if ( ! current_user_can( 'manage_network' ) )
-	wp_die( __( 'You do not have permission to access this page.' ) );
+	wp_die( __( 'You do not have permission to access this page.' ), 403 );
 
 echo '<div class="wrap">';
-screen_icon('tools');
 echo '<h2>' . __( 'Upgrade Network' ) . '</h2>';
 
 $action = isset($_GET['action']) ? $_GET['action'] : 'show';
@@ -53,7 +52,7 @@
 			update_site_option( 'wpmu_upgrade_site', $wp_db_version );
 		}
 
-		$blogs = $wpdb->get_results( "SELECT * FROM {$wpdb->blogs} WHERE site_id = '{$wpdb->siteid}' AND spam = '0' AND deleted = '0' AND archived = '0' ORDER BY registered DESC LIMIT {$n}, 5", ARRAY_A );
+		$blogs = $wpdb->get_results( "SELECT blog_id FROM {$wpdb->blogs} WHERE site_id = '{$wpdb->siteid}' AND spam = '0' AND deleted = '0' AND archived = '0' ORDER BY registered DESC LIMIT {$n}, 5", ARRAY_A );
 		if ( empty( $blogs ) ) {
 			echo '<p>' . __( 'All done!' ) . '</p>';
 			break;
@@ -64,16 +63,39 @@
 			$siteurl = site_url();
 			$upgrade_url = admin_url( 'upgrade.php?step=upgrade_db' );
 			restore_current_blog();
+
 			echo "<li>$siteurl</li>";
+
 			$response = wp_remote_get( $upgrade_url, array( 'timeout' => 120, 'httpversion' => '1.1' ) );
-			if ( is_wp_error( $response ) )
-				wp_die( sprintf( __( 'Warning! Problem updating %1$s. Your server may not be able to connect to sites running on it. Error message: <em>%2$s</em>' ), $siteurl, $response->get_error_message() ) );
+			if ( is_wp_error( $response ) ) {
+				wp_die( sprintf(
+					/* translators: 1: site url, 2: server error message */
+					__( 'Warning! Problem updating %1$s. Your server may not be able to connect to sites running on it. Error message: %2$s' ),
+					$siteurl,
+					'<em>' . $response->get_error_message() . '</em>'
+				) );
+			}
+
+			/**
+			 * Fires after the Multisite DB upgrade for each site is complete.
+			 *
+			 * @since MU
+			 *
+			 * @param array|WP_Error $response The upgrade response array or WP_Error on failure.
+			 */
 			do_action( 'after_mu_upgrade', $response );
+			/**
+			 * Fires after each site has been upgraded.
+			 *
+			 * @since MU
+			 *
+			 * @param int $blog_id The id of the blog.
+			 */
 			do_action( 'wpmu_upgrade_site', $details[ 'blog_id' ] );
 		}
 		echo "</ul>";
 		?><p><?php _e( 'If your browser doesn&#8217;t start loading the next page automatically, click this link:' ); ?> <a class="button" href="upgrade.php?action=upgrade&amp;n=<?php echo ($n + 5) ?>"><?php _e("Next Sites"); ?></a></p>
-		<script type='text/javascript'>
+		<script type="text/javascript">
 		<!--
 		function nextpage() {
 			location.href = "upgrade.php?action=upgrade&n=<?php echo ($n + 5) ?>";
@@ -93,6 +115,11 @@
 		<p><?php _e( 'The database upgrade process may take a little while, so please be patient.' ); ?></p>
 		<p><a class="button" href="upgrade.php?action=upgrade"><?php _e( 'Upgrade Network' ); ?></a></p>
 		<?php
+		/**
+		 * Fires before the footer on the network upgrade screen.
+		 *
+		 * @since MU
+		 */
 		do_action( 'wpmu_upgrade_page' );
 	break;
 }