再利用ブロックをスラッグで表示するショートコード

add_shoetcode-reusable-block.php

<?php
// [reusable slug=$slug]
add_shortcode(
	'reusable',
	function ( $atts ) {
		extract( shortcode_atts(
			array(
				'slug' => '',
			), $atts ) );
		ob_start();
		$args = array(
			'post_type' => array( 'wp_block' ),
			'name'      => $slug,
		);
		$query = new WP_Query( $args );
		if ( $query->have_posts() ) {
			while ( $query->have_posts() ) {
				$query->the_post();
				the_content();
			}
		}
		wp_reset_postdata();
		$html = ob_get_contents();
		ob_end_clean();
		return $html;
	}
);