Pattern Registration

<?php
/**
 * Title: Hero with Call to Action
 * Slug: theme-slug/hero-cta
 * Categories: banner, call-to-action
 */
?>
<!-- wp:group ... -->

my-theme/
  patterns/
    hero-cta.php
    testimonial-grid.php
    footer-columns.php
  theme.json
  style.css
  ...

<?php esc_html_e( 'Read More', 'theme-textdomain' ); ?>
<?php esc_attr_e( 'Submit', 'theme-textdomain' ); ?>
<?php echo esc_url( get_theme_file_uri( 'assets/images/placeholder.webp' ) ); ?>
<?php echo esc_attr( get_theme_file_uri( 'assets/images/bg.jpg' ) ); ?>

// WRONG: query-dependent — runs at init, not render
<?php $posts = get_posts(); ?>
<?php the_title(); ?>
<?php wp_get_current_user(); ?>
<?php is_admin(); ?>

<!-- wp:heading -->
<h2 class="wp-block-heading"><?php esc_html_e( 'Our Services', 'theme-textdomain' ); ?></h2>
<!-- /wp:heading -->

<!-- wp:button -->
<div class="wp-block-button"><a class="wp-block-button__link wp-element-button"><?php esc_html_e( 'Get Started', 'theme-textdomain' ); ?></a></div>
<!-- /wp:button -->

<!-- wp:image {"alt":"<?php esc_attr_e( 'Team photo', 'theme-textdomain' ); ?>"} -->

register_block_pattern(
    'my-plugin/testimonial-card',
    array(
        'title'       => __( 'Testimonial Card', 'my-plugin' ),
        'description' => __( 'A single testimonial with avatar and quote.', 'my-plugin' ),
        'categories'  => array( 'testimonials' ),
        'content'     => '<!-- wp:group ... --> ... <!-- /wp:group -->',
        'keywords'    => array( 'quote', 'review' ),
    )
);

add_action( 'init', function() {
    register_block_pattern( ... );
});

add_action( 'init', function() {
    register_block_pattern_category(
        'theme-slug-portfolio',
        array( 'label' => __( 'Portfolio', 'theme-textdomain' ) )
    );
});

{
    "patterns": {
        "categories": [
            { "name": "theme-slug-portfolio", "label": "Portfolio" }
        ]
    }
}

add_action( 'init', function() {
    unregister_block_pattern( 'core/query-standard-posts' );
});

unregister_block_pattern_category( 'banner' );