-update_category_cache();
-
-wp_get_current_user();
-
-$posts_per_page = get_settings('posts_per_page');
-$what_to_show = get_settings('what_to_show');
-$date_format = get_settings('date_format');
-$time_format = get_settings('time_format');
-
-$wpvarstoreset = array('profile','redirect','redirect_url','a','popuptitle','popupurl','text', 'trackback', 'pingback');
-for ($i=0; $i<count($wpvarstoreset); $i += 1) {
- $wpvar = $wpvarstoreset[$i];
- if (!isset($$wpvar)) {
- if (empty($_POST["$wpvar"])) {
- if (empty($_GET["$wpvar"])) {
- $$wpvar = '';
- } else {
- $$wpvar = $_GET["$wpvar"];
- }
- } else {
- $$wpvar = $_POST["$wpvar"];
- }
- }
+if ( get_option('db_upgraded') ) {
+ flush_rewrite_rules();
+ update_option( 'db_upgraded', false );
+
+ /**
+ * Fires on the next page load after a successful DB upgrade.
+ *
+ * @since 2.8.0
+ */
+ do_action( 'after_db_upgrade' );
+} elseif ( get_option('db_version') != $wp_db_version && empty($_POST) ) {
+ if ( !is_multisite() ) {
+ wp_redirect( admin_url( 'upgrade.php?_wp_http_referer=' . urlencode( wp_unslash( $_SERVER['REQUEST_URI'] ) ) ) );
+ exit;
+
+ /**
+ * Filter whether to attempt to perform the multisite DB upgrade routine.
+ *
+ * In single site, the user would be redirected to wp-admin/upgrade.php.
+ * In multisite, the DB upgrade routine is automatically fired, but only
+ * when this filter returns true.
+ *
+ * If the network is 50 sites or less, it will run every time. Otherwise,
+ * it will throttle itself to reduce load.
+ *
+ * @since 3.0.0
+ *
+ * @param bool true Whether to perform the Multisite upgrade routine. Default true.
+ */
+ } elseif ( apply_filters( 'do_mu_upgrade', true ) ) {
+ $c = get_blog_count();
+
+ /*
+ * If there are 50 or fewer sites, run every time. Otherwise, throttle to reduce load:
+ * attempt to do no more than threshold value, with some +/- allowed.
+ */
+ if ( $c <= 50 || ( $c > 50 && mt_rand( 0, (int)( $c / 50 ) ) == 1 ) ) {
+ require_once( ABSPATH . WPINC . '/http.php' );
+ $response = wp_remote_get( admin_url( 'upgrade.php?step=1' ), array( 'timeout' => 120, 'httpversion' => '1.1' ) );
+ /** This action is documented in wp-admin/network/upgrade.php */
+ do_action( 'after_mu_upgrade', $response );
+ unset($response);
+ }
+ unset($c);
+ }