<form method="POST">
    <h3>Editing: upgrade.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
/**
 * Multisite upgrade administration panel.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.0.0
 */

/** Load WordPress Administration Bootstrap */
require_once __DIR__ . '/admin.php';

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

// Used in the HTML title tag.
$title       = __( 'Upgrade Network' );
$parent_file = 'upgrade.php';

get_current_screen()-&gt;add_help_tab(
	array(
		'id'      =&gt; 'overview',
		'title'   =&gt; __( 'Overview' ),
		'content' =&gt;
			'&lt;p&gt;' . __( '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.' ) . '&lt;/p&gt;' .
			'&lt;p&gt;' . __( 'If a version update to core has not happened, clicking this button will not affect anything.' ) . '&lt;/p&gt;' .
			'&lt;p&gt;' . __( 'If this process fails for any reason, users logging in to their sites will force the same update.' ) . '&lt;/p&gt;',
	)
);

get_current_screen()-&gt;set_help_sidebar(
	'&lt;p&gt;&lt;strong&gt;' . __( 'For more information:' ) . '&lt;/strong&gt;&lt;/p&gt;' .
	'&lt;p&gt;' . __( '&lt;a href=&quot;https://developer.wordpress.org/advanced-administration/multisite/admin/#network-admin-updates-screen&quot;&gt;Documentation on Upgrade Network&lt;/a&gt;' ) . '&lt;/p&gt;' .
	'&lt;p&gt;' . __( '&lt;a href=&quot;https://wordpress.org/support/forums/&quot;&gt;Support forums&lt;/a&gt;' ) . '&lt;/p&gt;'
);

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

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

echo '&lt;div class=&quot;wrap&quot;&gt;';
echo '&lt;h1&gt;' . __( 'Upgrade Network' ) . '&lt;/h1&gt;';

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

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

		if ( $n &lt; 5 ) {
			/**
			 * @global int $wp_db_version WordPress database version.
			 */
			global $wp_db_version;
			update_site_option( 'wpmu_upgrade_site', $wp_db_version );
		}

		$site_ids = get_sites(
			array(
				'spam'                   =&gt; 0,
				'deleted'                =&gt; 0,
				'archived'               =&gt; 0,
				'network_id'             =&gt; get_current_network_id(),
				'number'                 =&gt; 5,
				'offset'                 =&gt; $n,
				'fields'                 =&gt; 'ids',
				'order'                  =&gt; 'DESC',
				'orderby'                =&gt; 'id',
				'update_site_meta_cache' =&gt; false,
			)
		);
		if ( empty( $site_ids ) ) {
			echo '&lt;p&gt;' . __( 'All done!' ) . '&lt;/p&gt;';
			break;
		}
		echo '&lt;ul&gt;';
		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 &quot;&lt;li&gt;$siteurl&lt;/li&gt;&quot;;

			$response = wp_remote_get(
				$upgrade_url,
				array(
					'timeout'     =&gt; 120,
					'httpversion' =&gt; '1.1',
					'sslverify'   =&gt; 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,
						'&lt;em&gt;' . $response-&gt;get_error_message() . '&lt;/em&gt;'
					)
				);
			}

			/**
			 * Fires after the Multisite DB upgrade for each site is complete.
			 *
			 * @since MU (3.0.0)
			 *
			 * @param array $response The upgrade response array.
			 */
			do_action( 'after_mu_upgrade', $response );

			/**
			 * Fires after each site has been upgraded.
			 *
			 * @since MU (3.0.0)
			 *
			 * @param int $site_id The Site ID.
			 */
			do_action( 'wpmu_upgrade_site', $site_id );
		}
		echo '&lt;/ul&gt;';
		?&gt;&lt;p&gt;&lt;?php _e( 'If your browser does not start loading the next page automatically, click this link:' ); ?&gt; &lt;a class=&quot;button&quot; href=&quot;upgrade.php?action=upgrade&amp;amp;n=&lt;?php echo ( $n + 5 ); ?&gt;&quot;&gt;&lt;?php _e( 'Next Sites' ); ?&gt;&lt;/a&gt;&lt;/p&gt;
		&lt;script type=&quot;text/javascript&quot;&gt;
		&lt;!--
		function nextpage() {
			location.href = &quot;upgrade.php?action=upgrade&amp;n=&lt;?php echo ( $n + 5 ); ?&gt;&quot;;
		}
		setTimeout( &quot;nextpage()&quot;, 250 );
		//--&gt;
		&lt;/script&gt;
		&lt;?php
		break;
	case 'show':
	default:
		if ( (int) get_site_option( 'wpmu_upgrade_site' ) !== $GLOBALS['wp_db_version'] ) :
			?&gt;
		&lt;h2&gt;&lt;?php _e( 'Database Update Required' ); ?&gt;&lt;/h2&gt;
		&lt;p&gt;&lt;?php _e( 'WordPress has been updated! Next and final step is to individually upgrade the sites in your network.' ); ?&gt;&lt;/p&gt;
		&lt;?php endif; ?&gt;

		&lt;p&gt;&lt;?php _e( 'The database update process may take a little while, so please be patient.' ); ?&gt;&lt;/p&gt;
		&lt;p&gt;&lt;a class=&quot;button button-primary&quot; href=&quot;upgrade.php?action=upgrade&quot;&gt;&lt;?php _e( 'Upgrade Network' ); ?&gt;&lt;/a&gt;&lt;/p&gt;
		&lt;?php
		/**
		 * Fires before the footer on the network upgrade screen.
		 *
		 * @since MU (3.0.0)
		 */
		do_action( 'wpmu_upgrade_page' );
		break;
}
?&gt;
&lt;/div&gt;

&lt;?php require_once ABSPATH . 'wp-admin/admin-footer.php'; ?&gt;
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