display_header example

<?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. */