Replace placeholder images with attribute values (woocommerce)

replaceImage.php

<?php
add_filter('woocommerce_cart_item_thumbnail', 'get_attr_image', 10, 3);
function get_attr_image($image, $item, $item_key)
{
	$img_url = array_shift( wc_get_product_terms( $item['product_id'], 'pa_image', array( 'fields' => 'names' ) ) );
	if($img_url)
	{
	    $dom = new DOMDocument();
	    $dom->loadHTML($image);
        $node = $dom->getElementsByTagName('img');
        $node->item(0)->setAttribute('src', $img_url);
        $image = $node->item(0)->ownerDocument->saveHTML($node->item(0));
	}

    return $image;
}

?>