取自同一个函数：

// prior to wordpress 4.5.0
$args = array(
    \'number\'     => $number,
    \'orderby\'    => $orderby,
    \'order\'      => $order,
    \'hide_empty\' => $hide_empty,
    \'include\'    => $ids
);

$product_categories = get_terms( \'product_cat\', $args );

// since wordpress 4.5.0
$args = array(
    \'taxonomy\'   => "product_cat",
    \'number\'     => $number,
    \'orderby\'    => $orderby,
    \'order\'      => $order,
    \'hide_empty\' => $hide_empty,
    \'include\'    => $ids
);
$product_categories = get_terms($args);