single.php

<?php
/**
 * The Template for displaying all single posts.
 *
 * @package cornerstone
 */
$url = get_post_meta($wp_query->post->ID,'external_link');
if(!empty($url)) wp_redirect($url[0]);
get_header(); ?>
<div id="page-single">
	<div class="col-sm-12">
    	
        <div class="col-md-9 col-md-push-3">

			<div id="primary" class="content-area">
				<main id="main" class="site-main" role="main">
		
				<?php while ( have_posts() ) : the_post(); ?>
		
					<?php get_template_part( 'content', 'single' ); ?>
		
					<?php cs_post_nav(); ?>
		
					<?php
						// If comments are open or we have at least one comment, load up the comment template
						if ( comments_open() || '0' != get_comments_number() ) :
							comments_template();
						endif;
					?>
		
				<?php endwhile; // end of the loop. ?>
		
				</main><!-- #main -->
			</div><!-- #primary -->
		</div>
        
        <div id="page-sidebar" class="col-sm-3 col-md-pull-9 widget-area" role="complementary">
			<?php if ( ! dynamic_sidebar( 'sidebar' ) ) : ?>
    
                <aside id="search" class="widget widget_search">
                    <?php get_search_form(); ?>
                </aside>
    
                <aside id="archives" class="widget">
                    <h1 class="widget-title"><?php _e( 'Archives', 'cs' ); ?></h1>
                    <ul>
                        <?php wp_get_archives( array( 'type' => 'monthly' ) ); ?>
                    </ul>
                </aside>
    
                <aside id="meta" class="widget">
                    <h1 class="widget-title"><?php _e( 'Meta', 'cs' ); ?></h1>
                    <ul>
                        <?php wp_register(); ?>
                        <li><?php wp_loginout(); ?></li>
                        <?php wp_meta(); ?>
                    </ul>
                </aside>
    
            <?php endif; // end sidebar widget area ?>
        </div><!-- #secondary -->
		
	</div>
</div>
<?php get_footer(); ?>