WooCommerce: Display Product Reviews @ Custom Page (Shortcode)

/**
 * @snippet       WooCommerce Product Reviews Shortcode
 * @how-to        Get tutoraspire.com FREE
 * @author        Tutor Aspire
 * @testedwith    WooCommerce 3.9
 * @donate $9     https://www.tutoraspire.com
 */

add_shortcode( 'product_reviews', 'tutoraspire_product_reviews_shortcode' );

function tutoraspire_product_reviews_shortcode( $atts ) {

if ( empty( $atts ) ) return '';

if ( ! isset( $atts['id'] ) ) return '';

$comments = get_comments( 'post_id=' . $atts['id'] );

if ( ! $comments ) return '';

$html .= '
';

foreach ( $comments as $comment ) {
$rating = intval( get_comment_meta( $comment->comment_ID, 'rating', true ) );
$html .= '
';
$html .= get_avatar( $comment, '60' );
$html .= '
';
if ( $rating ) $html .= wc_get_rating_html( $rating );
$html .= '
';
$html .= get_comment_author( $comment );
$html .= '
';
$html .= '
';
$html .= $comment->comment_content;
$html .= '
';
$html .= '
';
}

$html .= '
';

return $html;
}