<form method="POST">
    <h3>Editing: post-terms.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
/**
 * Server-side rendering of the `core/post-terms` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/post-terms` block on the server.
 *
 * @since 5.8.0
 *
 * @param array    $attributes Block attributes.
 * @param string   $content    Block default content.
 * @param WP_Block $block      Block instance.
 * @return string Returns the filtered post terms for the current post wrapped inside &quot;a&quot; tags.
 */
function render_block_core_post_terms( $attributes, $content, $block ) {
	if ( ! isset( $block-&gt;context['postId'] ) || ! isset( $attributes['term'] ) ) {
		return '';
	}

	if ( ! is_taxonomy_viewable( $attributes['term'] ) ) {
		return '';
	}

	$classes = array( 'taxonomy-' . $attributes['term'] );
	if ( isset( $attributes['textAlign'] ) ) {
		$classes[] = 'has-text-align-' . $attributes['textAlign'];
	}
	if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
		$classes[] = 'has-link-color';
	}

	$separator = empty( $attributes['separator'] ) ? ' ' : $attributes['separator'];

	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' =&gt; implode( ' ', $classes ) ) );

	$prefix = &quot;&lt;div $wrapper_attributes&gt;&quot;;
	if ( isset( $attributes['prefix'] ) &amp;&amp; $attributes['prefix'] ) {
		$prefix .= '&lt;span class=&quot;wp-block-post-terms__prefix&quot;&gt;' . $attributes['prefix'] . '&lt;/span&gt;';
	}

	$suffix = '&lt;/div&gt;';
	if ( isset( $attributes['suffix'] ) &amp;&amp; $attributes['suffix'] ) {
		$suffix = '&lt;span class=&quot;wp-block-post-terms__suffix&quot;&gt;' . $attributes['suffix'] . '&lt;/span&gt;' . $suffix;
	}

	$post_terms = get_the_term_list(
		$block-&gt;context['postId'],
		$attributes['term'],
		wp_kses_post( $prefix ),
		'&lt;span class=&quot;wp-block-post-terms__separator&quot;&gt;' . esc_html( $separator ) . '&lt;/span&gt;',
		wp_kses_post( $suffix )
	);

	if ( is_wp_error( $post_terms ) || empty( $post_terms ) ) {
		return '';
	}

	return $post_terms;
}

/**
 * Returns the available variations for the `core/post-terms` block.
 *
 * @since 6.5.0
 *
 * @return array The available variations for the block.
 */
function block_core_post_terms_build_variations() {
	$taxonomies = get_taxonomies(
		array(
			'publicly_queryable' =&gt; true,
			'show_in_rest'       =&gt; true,
		),
		'objects'
	);

	// Split the available taxonomies to `built_in` and custom ones,
	// in order to prioritize the `built_in` taxonomies at the
	// search results.
	$built_ins         = array();
	$custom_variations = array();

	// Create and register the eligible taxonomies variations.
	foreach ( $taxonomies as $taxonomy ) {
		$variation = array(
			'name'        =&gt; $taxonomy-&gt;name,
			'title'       =&gt; $taxonomy-&gt;label,
			'description' =&gt; sprintf(
				/* translators: %s: taxonomy's label */
				__( 'Display a list of assigned terms from the taxonomy: %s' ),
				$taxonomy-&gt;label
			),
			'attributes'  =&gt; array(
				'term' =&gt; $taxonomy-&gt;name,
			),
			'isActive'    =&gt; array( 'term' ),
			'scope'       =&gt; array( 'inserter', 'transform' ),
		);
		// Set the category variation as the default one.
		if ( 'category' === $taxonomy-&gt;name ) {
			$variation['isDefault'] = true;
		}
		if ( $taxonomy-&gt;_builtin ) {
			$built_ins[] = $variation;
		} else {
			$custom_variations[] = $variation;
		}
	}

	return array_merge( $built_ins, $custom_variations );
}

/**
 * Registers the `core/post-terms` block on the server.
 *
 * @since 5.8.0
 */
function register_block_core_post_terms() {
	register_block_type_from_metadata(
		__DIR__ . '/post-terms',
		array(
			'render_callback'    =&gt; 'render_block_core_post_terms',
			'variation_callback' =&gt; 'block_core_post_terms_build_variations',
		)
	);
}
add_action( 'init', 'register_block_core_post_terms' );
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