Adding Open Graph Meta Tags to the Genesis Theme Head

genesis-open-graph.php

<?php
//* Call the First Image in a Post (Used in the Open Graph Call Below)
function catch_first_image() {
  global $post, $posts;
  $first_img = '';
  ob_start();
  ob_end_clean();
  $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
  $first_img = $matches [1] [0];

  if(empty($first_img)){ //Define default image
    $first_img = "/images/defalut.jpg";
  }

  return $first_img;

}

//* Add Open Graph meta tag to Head
add_action( 'genesis_meta', 'fb_opengraph' );
function fb_opengraph() {
  global $post;

  if( has_post_thumbnail( $post->ID ) ) {
    $img_src = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail' )[0];
  }
  else {
    $img_src = catch_first_image();
  }

?>
<meta property="og:image" content="<?php echo $img_src; ?>">
<meta property="og:title" content="<?php echo the_title(); ?>">
<meta property="og:url" content="<?php echo the_permalink(); ?>">
<meta property="og:description" content="<?php echo genesis_get_custom_field( '_genesis_description' ) ?>">
<?php
}