Function to Disable Free Orders Completed Email

gistfile1.txt

/**
 * This function checks if an order has a total of zero (free), and if so, stops the "Completed order" email from being sent.
 *
 * @param bool $is_enabled - Original state of the email (enabled/disabled)
 * @param WC_Order $order - The order object for which the email is being sent
 * @return bool - Modified state of the email (enabled/disabled)
 */
function disable_free_order_completed_email( $is_enabled, $order ) {
    // Check if the order total is zero
    if ( 0 == $order->get_total() ) {
        // If the order total is zero, disable the email
        $is_enabled = false;
    }

    // Return the possibly-modified email state
    return $is_enabled;
}
// The 'woocommerce_email_enabled_customer_completed_order' filter allows enabling/disabling the "Completed order" email
// We hook into it with our function above, passing the original email state and the order object
add_filter( 'woocommerce_email_enabled_customer_completed_order', 'disable_free_order_completed_email', 10, 2 );