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Last active Sep 24, 2018
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Add Open Graph Markup to WordPress Theme
function add_opengraph_markup() {
if (is_single()) {
global $post;
if(get_the_post_thumbnail($post->ID, 'thumbnail')) {
$thumbnail_id = get_post_thumbnail_id($post->ID);
$thumbnail_object = get_post($thumbnail_id);
$image = $thumbnail_object->guid;
} else {
// set default image
$image = '';
//$description = get_bloginfo('description');
$description = substr(strip_tags($post->post_content),0,200) . '...';
<meta property="og:title" content="<?php the_title(); ?>" />
<meta property="og:type" content="article" />
<meta property="og:image" content="<?=$image?>" />
<meta property="og:url" content="<?php the_permalink(); ?>" />
<meta property="og:description" content="<?=$description?>" />
<meta property="og:site_name" content="<?=get_bloginfo('name')?>" />
add_action('wp_head', 'add_opengraph_markup');
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tlongren commented Apr 2, 2015

If no image is set for a post or page, the $image variable can set or dynamically constructed to point to an image on your server. To point it to a static file, line 11 would look like:

$image = '';

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arximughal commented Oct 16, 2015

added this to my theme's function.php file, now wp-admin won't return anything but a blank page.
removing this code corrects the wp-admin problem.
any idea what's happening ?

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