Custom Fields and Post Meta in Themes — a practical guide to WordPress post meta in themes with clear examples you can reuse in real projects.
WordPress Theme Development Series (38/96). Prefer one article? Read the complete WordPress theme development tutorial.
Short description
Read meta with `get_post_meta()` and escape on output. Prefer registered meta / block bindings for modern workflows.
Display meta
$isbn = get_post_meta(get_the_ID(), '_acme_isbn', true);
if ($isbn) {
echo '<p>ISBN: ' . esc_html($isbn) . '</p>';
}