X（旧Tweet）で、アイキャッチ画像を表示させるコード

<!-- Open Graph Tags -->
<meta property="og:title" content="<?php the_title(); ?>" />
<meta property="og:description" content="<?php echo get_the_excerpt(); ?>" />
<meta property="og:image" content="<?php echo get_the_post_thumbnail_url(); ?>" />
<meta property="og:url" content="<?php the_permalink(); ?>" />
<meta property="og:type" content="article" />

<!-- Twitter Card Tags -->
<meta name="twitter:card" content="summary_large_image" />
<meta name="twitter:title" content="<?php the_title(); ?>" />
<meta name="twitter:description" content="<?php echo get_the_excerpt(); ?>" />
<meta name="twitter:image" content="<?php echo wp_get_attachment_url(get_post_thumbnail_id($post->ID)); ?>" />
<meta name="twitter:url" content="<?php the_permalink(); ?>" />