~canonical-sysadmins/wordpress/4.7.2

'<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’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="http://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.' ) );

echo '<div class="wrap">';

echo '<h2>' . __( 'Upgrade Network' ) . '</h2>';

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

switch ( $action ) {

case "upgrade":

$n = ( isset($_GET['n']) ) ? intval($_GET['n']) : 0;

if ( $n < 5 ) {

global $wp_db_version;

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 );

if ( empty( $blogs ) ) {

echo '<p>' . __( 'All done!' ) . '</p>';

break;

}

echo "<ul>";

foreach ( (array) $blogs as $details ) {

switch_to_blog( $details['blog_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' ) );

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() ) );

/**

* 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’t start loading the next page automatically, click this link:' ); ?> <a class="button" href="upgrade.php?action=upgrade&n=<?php echo ($n + 5) ?>"><?php _e("Next Sites"); ?></a></p>

<!--

function nextpage() {

location.href = "upgrade.php?action=upgrade&n=<?php echo ($n + 5) ?>";

}

setTimeout( "nextpage()", 250 );

//-->

</script><?php

break;

case 'show':

default:

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if ( get_site_option( 'wpmu_upgrade_site' ) != $GLOBALS['wp_db_version'] ) :

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<?php endif; ?>

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<?php

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/**

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* Fires before the footer on the network upgrade screen.

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* @since MU

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do_action( 'wpmu_upgrade_page' );

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break;

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}

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</div>

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

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