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EDIT :: upgrade.php

<?php
/**
 * Multisite upgrade administration panel.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.0.0
 */

/** Load WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

require_once( ABSPATH . WPINC . '/http.php' );

$title = __( 'Upgrade Network' );
$parent_file = 'upgrade.php';

get_current_screen()->add_help_tab( array(
	'id'      => 'overview',
	'title'   => __('Overview'),
	'content' =>
		'<p>' . __('Only use this screen once you have updated to a new version of WordPress through Updates/Available Updates (via the Network Administration navigation menu or the Toolbar). Clicking the Upgrade Network button will step through each site in the network, five at a time, and make sure any database updates are applied.') . '</p>' .
		'<p>' . __('If a version update to core has not happened, clicking this button won&#8217;t affect anything.') . '</p>' .
		'<p>' . __('If this process fails for any reason, users logging in to their sites will force the same update.') . '</p>'
) );

get_current_screen()->set_help_sidebar(
	'<p><strong>' . __('For more information:') . '</strong></p>' .
	'<p>' . __('<a href="https://codex.wordpress.org/Network_Admin_Updates_Screen">Documentation on Upgrade Network</a>') . '</p>' .
	'<p>' . __('<a href="https://wordpress.org/support/">Support Forums</a>') . '</p>'
);

require_once( ABSPATH . 'wp-admin/admin-header.php' );

if ( ! current_user_can( 'manage_network' ) )
	wp_die( __( 'Sorry, you are not allowed to access this page.' ), 403 );

echo '<div class="wrap">';
echo '<h1>' . __( 'Upgrade Network' ) . '</h1>';

$action = isset($_GET['action']) ? $_GET['action'] : 'show';

switch ( $action ) {
	case "upgrade":
		$n = ( isset($_GET['n']) ) ? intval($_GET['n']) : 0;

if ( $n < 5 ) {
			/**
			 * @global string $wp_db_version
			 */
			global $wp_db_version;
			update_site_option( 'wpmu_upgrade_site', $wp_db_version );
		}

$site_ids = get_sites( array(
			'spam'       => 0,
			'deleted'    => 0,
			'archived'   => 0,
			'network_id' => get_current_network_id(),
			'number'     => 5,
			'offset'     => $n,
			'fields'     => 'ids',
			'order'      => 'DESC',
			'orderby'    => 'id',
		) );
		if ( empty( $site_ids ) ) {
			echo '<p>' . __( 'All done!' ) . '</p>';
			break;
		}
		echo "<ul>";
		foreach ( (array) $site_ids as $site_id ) {
			switch_to_blog( $site_id );
			$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',
				'sslverify'   => false,
			) );
			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 $site_id The Site ID.
			 */
			do_action( 'wpmu_upgrade_site', $site_id );
		}
		echo "</ul>";
		?><p><?php _e( 'If your browser doesn&#8217;t start loading the next page automatically, click this link:' ); ?> <a class="button" href="upgrade.php?action=upgrade&amp;n=<?php echo ($n + 5) ?>"><?php _e("Next Sites"); ?></a></p>
		<script type="text/javascript">
		
		</script><?php
	break;
	case 'show':
	default:
		if ( get_site_option( 'wpmu_upgrade_site' ) != $GLOBALS['wp_db_version'] ) :
		?>
		<h2><?php _e( 'Database Update Required' ); ?></h2>
		<p><?php _e( 'WordPress has been updated! Before we send you on your way, we need to individually upgrade the sites in your network.' ); ?></p>
		<?php endif; ?>

<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>

CANCEL

// SYSTEM PANEL //

EDIT :: upgrade.php