WooCommerce - Get custom product attribute

Question

I am trying to get a specific custom attribute in woocommerce. I've read tons of threads on this site which offer about 3-5 methods how to do it. After trying all, the only method that worked for me is to loop through all attributes - all others did not work. I have a custom attribute named 'pdfs'

The following tries did not work: (link)

 $global product;
 $myPdf = array_shift( wc_get_product_terms( $product->id, 'pdfs', array( 'fields' => 'names' ) ) );

 $myPdf = $product->get_attribute( 'pdfs' );

 $myPdf = get_post_meta($product->id, 'pdfs', true);

This is the only one that did work: (link)

 $attributes = $product->get_attributes();
 foreach ( $attributes as $attribute ) {
    if (attribute_label( $attribute[ 'name' ] ) == "pdfs" ) {
        echo array_shift( wc_get_product_terms( $product->id,  $attribute[ 'name' ] ) );
    }
}

I would much rather be able to use one of the first options Any help would be appreciated.
Thanks

Answer 1

Update: Added compatibility for Woocommerce 3+

As attributes are always prepend with pa_ in DB, for getting them with wc_get_product_terms() function, you will need to use pa_pdfs instead of pdfs, this way:

global $product;

$product_id = method_exists( $product, 'get_id' ) ? $product->get_id() : $product->id; // Added WC 3+ support

$myPdf = array_shift( wc_get_product_terms( $product_id, 'pa_pdfs', array( 'fields' => 'names' ) ) );

Reference: How to get a products custom attributes from WooCommerce