Woocommerce - Get SKU in product single page
get_sku() is a method of the WC_Product class, so you need to have a product on which to call it, like this:
<?php echo $product->get_sku(); ?>This should work if you are inside the WooCommerce product loop, and is what is used in the WooCommerce template files. If you don't already have a reference to the product object, you may need to add the following line at the top of the file in order to access it:
global $product;