Open Graph Meta

<?php if (  (function_exists('has_post_thumbnail')) && (has_post_thumbnail())  ) { ?>
<?php $thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'mvp-post-thumb' ); ?>
<meta property="og:image" content="<?php echo esc_url( $thumb['0'] ); ?>" />
<meta name="twitter:image" content="<?php echo esc_url( $thumb['0'] ); ?>" />
<?php } ?>

<?php if ( is_single() ) { ?>
<meta property="og:type" content="article" />
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<meta property="og:description" content="<?php echo strip_tags(get_the_excerpt()); ?>" />
<meta name="twitter:card" content="summary">
<meta name="twitter:url" content="<?php the_permalink() ?>">
<meta name="twitter:title" content="<?php the_title(); ?>">
<meta name="twitter:description" content="<?php echo strip_tags(get_the_excerpt()); ?>">
<?php endwhile; endif; ?>
<?php } else { ?>
<meta property="og:description" content="<?php bloginfo('description'); ?>" />
<?php } ?>