post_class example

?> <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>> <header class="entry-header"> <?php if ( is_singular() ) : ?> <?php the_title( '<h1 class="entry-title default-max-width">', '</h1>' ); ?> <?php else : ?> <?php the_title( sprintf( '<h2 class="entry-title default-max-width"><a href="%s">', esc_url( get_permalink() ) ), '</a></h2>' ); ?> <?php endif; ?> <?php twenty_twenty_one_post_thumbnail(); ?> </header><!-- .entry-header --> <div class="entry-content">

?> <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>> <?php if ( ! is_front_page() ) : ?> <header class="entry-header alignwide"> <?php get_template_part( 'template-parts/header/entry-header' ); ?> <?php twenty_twenty_one_post_thumbnail(); ?> </header><!-- .entry-header --> <?php elseif ( has_post_thumbnail() ) : ?> <header class="entry-header alignwide"> <?php twenty_twenty_one_post_thumbnail(); ?> </header><!-- .entry-header --> <?php endif; ?>

get_header();

// Start the loop. while ( have_posts() ) {
    the_post();
    ?> <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>> <header class="entry-header alignwide"> <?php the_title( '<h1 class="entry-title">', '</h1>' ); ?> </header><!-- .entry-header --> <div class="entry-content"> <figure class="wp-block-image"> <?php                 /** * Filter the default image attachment size. * * @since Twenty Twenty-One 1.0 * * @param string $image_size Image size. Default 'full'. */

?> <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>> <header class="entry-header alignwide"> <?php the_title( '<h1 class="entry-title">', '</h1>' ); ?> <?php twenty_twenty_one_post_thumbnail(); ?> </header><!-- .entry-header --> <div class="entry-content"> <?php         the_content();

        wp_link_pages(
            

/** * Contains the post embed content template part * * When a post is embedded in an iframe, this file is used to create the content template part * output if the active theme does not include an embed-content.php template. * * @package WordPress * @subpackage Theme_Compat * @since 4.5.0 */
?> <div <?php post_class( 'wp-embed' ); ?>> <?php         $thumbnail_id = 0;

        if ( has_post_thumbnail() ) {
            $thumbnail_id = get_post_thumbnail_id();
        }

        if ( 'attachment' === get_post_type() && wp_attachment_is_image() ) {
            $thumbnail_id = get_the_ID();
        }

        

?> <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>> <?php get_template_part( 'template-parts/header/excerpt-header', get_post_format() ); ?> <div class="entry-content"> <?php get_template_part( 'template-parts/excerpt/excerpt', get_post_format() ); ?> </div><!-- .entry-content --> <footer class="entry-footer default-max-width"> <?php twenty_twenty_one_entry_meta_footer(); ?> </footer><!-- .entry-footer --> </article><!-- #post-${ID} -->