How to add or remove coupons dynamically based on cart total, on WooCommerce

Imagine the scenario where we have 2 coupons, one (5off) that gives $5 discount to the total client order, as well as a coupon (10off) that gives $10 discount to the total client order.

When the user inserts any of the coupons in, we want the $10 off coupon to apply only if the total order value is over $50, otherwise, we want the $5 coupon to apply instead.

<?php
/**
 * @snippet Add / Remove A Coupon Dynamically based on Cart Subtotal with WooCommerce
 * @sourcecode https://headless.wpharvest.com
 * @author Dragos Micu
 */
add_action( 'woocommerce_calculate_totals', 'wpharvest_apply_coupons' );
function wpharvest_apply_coupons($cart) {
    global $woocommerce;
    // Set your coupon codes
    $coupon10off = '10off';
    $coupon5off = '5off';

    // Get the cart subtotal
    $cart_subtotal = $cart->subtotal;
    // If cart subtotal is less than 50 add or remove coupons
    if ($cart_subtotal < 50) {
        if ( $woocommerce->cart->has_discount( $coupon10off ) ) {
            $cart->remove_coupon( $coupon10off );
            $woocommerce->cart->add_discount( $coupon5off );
        }
    }
    // If cart subtotal is greater 49 add or remove coupons
    if ($cart_subtotal > 49 ) {
        if ( $woocommerce->cart->has_discount( $coupon5off ) ) {
            $cart->remove_coupon( $coupon5off );
            $woocommerce->cart->add_discount( $coupon10off );
        }
    }
}
Code language: PHP (php)

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