5 => 'meta-2',
				),
				'array_version'       => 3,
			)
		);
		if ( ! is_multisite() ) {
			update_user_meta( $user_id, 'show_welcome_panel', 1 );
		} elseif ( ! is_super_admin( $user_id ) && ! metadata_exists( 'user', $user_id, 'show_welcome_panel' ) ) {
			update_user_meta( $user_id, 'show_welcome_panel', 2 );
		}

		if ( is_multisite() ) {
			// Flush rules to pick up the new page.
			$wp_rewrite->init();
			$wp_rewrite->flush_rules();

			$user = new WP_User( $user_id );
			$wpdb->update( $wpdb->options, array( 'option_value' => $user->user_email ), array( 'option_name' => 'admin_email' ) );

			// Remove all perms except for the login user.
			$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->usermeta WHERE user_id != %d AND meta_key = %s", $user_id, $table_prefix . 'user_level' ) );
			$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->usermeta WHERE user_id != %d AND meta_key = %s", $user_id, $table_prefix . 'capabilities' ) );

			// Delete any caps that snuck into the previously active blog. (Hardcoded to blog 1 for now.) TODO: Get previous_blog_id.
			if ( ! is_super_admin( $user_id ) && $user_id != 1 ) {
				$wpdb->delete(
					$wpdb->usermeta,
					array(
						'user_id'  => $user_id,
						'meta_key' => $wpdb->base_prefix . '1_capabilities',
					)
				);
			}
		}
	}
endif;

/**
 * Maybe enable pretty permalinks on installation.
 *
 * If after enabling pretty permalinks don't work, fallback to query-string permalinks.
 *
 * @since 4.2.0
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @return bool Whether pretty permalinks are enabled. False otherwise.
 */
function wp_install_maybe_enable_pretty_permalinks() {
	global $wp_rewrite;

	// Bail if a permalink structure is already enabled.
	if ( get_option( 'permalink_structure' ) ) {
		return true;
	}

	/*
	 * The Permalink structures to attempt.
	 *
	 * The first is designed for mod_rewrite or nginx rewriting.
	 *
	 * The second is PATHINFO-based permalinks for web server configurations
	 * without a true rewrite module enabled.
	 */
	$permalink_structures = array(
		'/%year%/%monthnum%/%day%/%postname%/',
		'/index.php/%year%/%monthnum%/%day%/%postname%/',
	);

	foreach ( (array) $permalink_structures as $permalink_structure ) {
		$wp_rewrite->set_permalink_structure( $permalink_structure );

		/*
		  * Flush rules with the hard option to force refresh of the web-server's
		  * rewrite config file (e.g. .htaccess or web.config).
		  */
		$wp_rewrite->flush_rules( true );

		$test_url = '';

		// Test against a real WordPress Post
		$first_post = get_page_by_path( sanitize_title( _x( 'hello-world', 'Default post slug' ) ), OBJECT, 'post' );
		if ( $first_post ) {
			$test_url = get_permalink( $first_post->ID );
		}

		/*
		  * Send a request to the site, and check whether
		  * the 'x-pingback' header is returned as expected.
		  *
		  * Uses wp_remote_get() instead of wp_remote_head() because web servers
		  * can block head requests.
		  */
		$response          = wp_remote_get( $test_url, array( 'timeout' => 5 ) );
		$x_pingback_header = wp_remote_retrieve_header( $response, 'x-pingback' );
		$pretty_permalinks = $x_pingback_header && $x_pingback_header === get_bloginfo( 'pingback_url' );

		if ( $pretty_permalinks ) {
			return true;
		}
	}

	/*