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add_help_tab(
array(
'id' => 'overview',
'title' => __( 'Overview' ),
'content' =>
'' . __( '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.' ) . '
' .
'' . __( 'If a version update to core has not happened, clicking this button will not affect anything.' ) . '
' .
'' . __( 'If this process fails for any reason, users logging in to their sites will force the same update.' ) . '
',
)
);
get_current_screen()->set_help_sidebar(
'' . __( 'For more information:' ) . '
' .
'' . __( 'Documentation on Upgrade Network' ) . '
' .
'' . __( 'Support forums' ) . '
'
);
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 '';
echo '
' . __( 'Upgrade Network' ) . '
';
$action = isset( $_GET['action'] ) ? $_GET['action'] : 'show';
switch ( $action ) {
case 'upgrade':
$n = ( isset( $_GET['n'] ) ) ? (int) $_GET['n'] : 0;
if ( $n < 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' => 0,
'deleted' => 0,
'archived' => 0,
'network_id' => get_current_network_id(),
'number' => 5,
'offset' => $n,
'fields' => 'ids',
'order' => 'DESC',
'orderby' => 'id',
'update_site_meta_cache' => false,
)
);
if ( empty( $site_ids ) ) {
echo '
' . __( 'All done!' ) . '
';
break;
}
echo '
';
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 "- $siteurl
";
$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,
'' . $response->get_error_message() . ''
)
);
}
/**
* 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 '
';
?>