Insert Custom Fields into WordPress Shortcode

custom-fields-inside-shortcode.php

<?php //* Mind this opening PHP tag

/** 
 * This snippet will take a custom field and add its data to a shortcode. 
 * In this example, we are adding a few WooCommerce products before the content of a Genesis theme.
 * The code is taking the product IDs entered in the home page's edit panel and dynamically inserting 
 * them into a WooCommerce shortcode, which then outputs the products with those IDs.
 * 
 * Read more about this example and the process of adding custom fields into shortcodes at EngageWP.com
 * http://www.engagewp.com/how-to-insert-custom-fields-into-shortcodes
 */  
add_action( 'genesis_before_content', 'display_featured_products' );
function display_featured_products() {

	global $post;

	if ( is_front_page() ) {

		$custom_ids = get_post_meta( $post->ID, 'featured_products_ids', true );

		echo do_shortcode( '[products ids="' . $custom_ids . '"]' );

	}

}