Print WC Product SKU

echo-wc-sku.php

/**
 * Echos the SKU for the product when used on a single product page
 * Can optionally pass in the ID to echo the SKU for a product elsewhere
 * Use [wc_sku] or [wc_sku id="ID"]
 * Tutorial: http://www.skyverge.com/blog/output-woocommerce-sku/
**/

function skyverge_get_product_sku( $atts ) {
	
	global $product;
		
	$atts = shortcode_atts( array(
        	'id'  =>  '',
    	), $atts );
  
  	// If no id, we're probably on a product page already
  	if ( empty( $atts['id'] ) ) {
		
		$sku = $product->get_sku();
		
	} else {
		
		//get which product from ID we should display a SKU for
		$product = wc_get_product( $atts['id'] );
	  	$sku = $product->get_sku();
		
	}

	ob_start();
	
	//Only echo if there is a SKU
	if ( !empty( $sku ) ) {
		echo $sku;
	}
	
	return ob_get_clean();
	
}
add_shortcode( 'wc_sku', 'skyverge_get_product_sku' );