add_action('wp_footer', function () {
if ( ! is_singular() ) return;
$post_id = get_queried_object_id();
$img = $post_id ? get_the_post_thumbnail_url($post_id, 'full') : '';
echo "\n\n";
echo "TOTS DEBUG: mu-plugin is running.
\n";
echo "Post ID: " . esc_html($post_id) . "
\n";
echo "Featured image: " . ($img ? esc_html($img) : "NONE") . "\n";
echo "
\n";
}, 9999);
October 20, 2009 - Talk of the Sound
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