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is_blog_installed example

return compact( 'title', 'url', 'link', 'items', 'error', 'show_summary', 'show_author', 'show_date' );
}

/** * Registers all of the default WordPress widgets on startup. * * Calls {@see 'widgets_init'} action after all of the WordPress widgets have been registered. * * @since 2.2.0 */
function wp_widgets_init() {
    if ( ! is_blog_installed() ) {
        return;
    }

    register_widget( 'WP_Widget_Pages' );

    register_widget( 'WP_Widget_Calendar' );

    register_widget( 'WP_Widget_Archives' );

    if ( get_option( 'link_manager_enabled' ) ) {
        register_widget( 'WP_Widget_Links' );
    }

    function wp_upgrade() {
        global $wp_current_db_version, $wp_db_version, $wpdb;

        $wp_current_db_version = __get_option( 'db_version' );

        // We are up to date. Nothing to do.         if ( $wp_db_version == $wp_current_db_version ) {
            return;
        }

        if ( ! is_blog_installed() ) {
            return;
        }

        wp_check_mysql_version();
        wp_cache_flush();
        pre_schema_upgrade();
        make_db_current_silent();
        upgrade_all();
        if ( is_multisite() && is_main_site() ) {
            upgrade_network();
        }

/** * Redirects to the installer if WordPress is not installed. * * Dies with an error message when Multisite is enabled. * * @since 3.0.0 * @access private */
function wp_not_installed() {
    if ( is_blog_installed() || wp_installing() ) {
        return;
    }

    nocache_headers();

    if ( is_multisite() ) {
        wp_die( __( 'The site you have requested is not installed properly. Please contact the system administrator.' ) );
    }

    require ABSPATH . WPINC . '/kses.php';
    require ABSPATH . WPINC . '/pluggable.php';

</fieldset> </td> </tr> </table> <p class="step"><?php submit_button( __( 'Install WordPress' ), 'large', 'Submit', false, array( 'id' => 'submit' ) ); ?></p> <input type="hidden" name="language" value="<?php echo isset( $_REQUEST['language'] ) ? esc_attr( $_REQUEST['language'] ) : ''; ?>" /> </form> <?php } // End display_setup_form().
// Let's check to make sure WP isn't already installed. if ( is_blog_installed() ) {
    display_header();
    die(
        '<h1>' . __( 'Already Installed' ) . '</h1>' .
        '<p>' . __( 'You appear to have already installed WordPress. To reinstall please clear your old database tables first.' ) . '</p>' .
        '<p class="step"><a href="' . esc_url( wp_login_url() ) . '">' . __( 'Log In' ) . '</a></p>' .
        '</body></html>'
    );
}

/** * @global string $wp_version The WordPress version string. * @global string $required_php_version The required PHP version string. * @global string $required_mysql_version The required MySQL version string. * @global wpdb $wpdb WordPress database abstraction object. */

<?php language_attributes(); ?>> <head> <meta name="viewport" content="width=device-width" /> <meta http-equiv="Content-Type" content="<?php bloginfo( 'html_type' ); ?>; charset=<?php echo get_option( 'blog_charset' ); ?>" /> <meta name="robots" content="noindex,nofollow" /> <title><?php _e( 'WordPress &rsaquo; Update' ); ?></title> <?php wp_admin_css( 'install', true ); ?> </head> <body class="wp-core-ui"> <p id="logo"><a href="<?php echo esc_url( __( 'https://wordpress.org/' ) ); ?>"><?php _e( 'WordPress' ); ?></a></p> <?php if ( (int) get_option( 'db_version' ) === $wp_db_version || ! is_blog_installed() ) : ?> <h1><?php _e( 'No Update Required' ); ?></h1> <p><?php _e( 'Your WordPress database is already up to date!' ); ?></p> <p class="step"><a class="button button-large" href="<?php echo get_option( 'home' ); ?>/"><?php _e( 'Continue' ); ?></a></p> <?php elseif ( ! $php_compat || ! $mysql_compat ) :
    $version_url = sprintf(
        /* translators: %s: WordPress version. */
        esc_url( __( 'https://wordpress.org/documentation/wordpress-version/version-%s/' ) ),
        sanitize_title( $wp_version )
    );