Content Block Featured Image

functions.php

// Add the ability to display the content block in a reqular post using a shortcode
function custom_post_image_shortcode( $atts ) {
	$params = shortcode_atts( array(
		'id' => '',
		'slug' => '',
		'class' => 'content_block_image',
		'suppress_content_filters' => 'no'
	), $atts );

	if ( $params["slug"] ) {
		$block = get_page_by_path( $params["slug"], OBJECT, 'content_block' );
		if ( $block ) {
			$params["id"] = $block->ID;
		}
	}

	$content = "";

	if( $params["id"] != "" ) {
		$args = array(
			'post__in' => array( $params["id"] ),
      'post_type' => 'content_block',
      'class' => 'content_block_featured'
		);

		$content_post = get_posts( $args );
    $inline_style = "";

		foreach( $content_post as $post ) {

      if ( has_post_thumbnail( $post->ID ) ) {
        $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail' );
        $image = $image[0];
    
        $inline_style = 'style="background-image: url('.$image.')"';
      }

			$content .= '<div class="'. esc_attr( $params["class"] ). '" ' . $inline_style . '></div>';
    }
	}

	return $content;
}
add_shortcode( 'content_block_featured_image', 'custom_post_image_shortcode' );