WooCommerce:检查优惠券是否有效

我认为WooCommerce鼓励的推荐方法是使用WC_Discounts类。这里有一个例子：

function is_coupon_valid( $coupon_code ) {
    $coupon = new WC_Coupon( $coupon_code );   
    $discounts = new WC_Discounts( WC()->cart );
    $response = $discounts->is_coupon_valid( $coupon );
    return is_wp_error( $response ) ? false : true;     
}

注意：也可以使用WC_Order对象初始化WC_Discounts类。

重要的是要记住，至少在wp_loaded钩子中这样做，如下所示：

add_action( 'wp_loaded', function(){
   is_coupon_valid('my-coupon-code');
});

WC_Coupon类中有一个明显更简单的方法is_valid()，但它被弃用，取而代之的是WC_Discounts->is_coupon_valid()

$coupon = new WC_Coupon( 'my-coupon-code' );
$coupon->is_valid();

add_action( 'rest_api_init', 'coupon' );
function coupon($request) {
  register_rest_route('custom-plugin', '/coupon_code/',
    array(
      'methods'  => 'POST',
      'callback' => 'coupon_code',
    )
  );
}
function coupon_code($request)
{
$code = $request->get_param('coupon');
$applied_coupon = $request->get_param('applied_coupon');
$cart_amount = $request->get_param('cart_amount');
$user_id = $request->get_param('user_id');
// $code = 'test123';

$coupon = new WC_Coupon($code);
$coupon_post = get_post($coupon->id);
$coupon_data = array(
    'id' => $coupon->id,
    'code' => esc_attr($coupon_post->post_title),
    'type' => $coupon->type,
    'created_at' => $coupon_post->post_date_gmt,
    'updated_at' => $coupon_post->post_modified_gmt,
    'amount' => wc_format_decimal($coupon->coupon_amount, 2),
    'individual_use' => ( 'yes' === $coupon->individual_use ),
    'product_ids' => array_map('absint', (array) $coupon->product_ids),
    'exclude_product_ids' => array_map('absint', (array) $coupon->exclude_product_ids),
    'usage_limit' => (!empty($coupon->usage_limit) ) ? $coupon->usage_limit : null,
    'usage_count' => (int) $coupon->usage_count,
    'expiry_date' => (!empty($coupon->expiry_date) ) ? date('Y-m-d', $coupon->expiry_date) : null,
    'enable_free_shipping' => $coupon->enable_free_shipping(),
    'product_category_ids' => array_map('absint', (array) $coupon->product_categories),
    'exclude_product_category_ids' => array_map('absint', (array) $coupon->exclude_product_categories),
    'exclude_sale_items' => $coupon->exclude_sale_items(),
    'minimum_amount' => wc_format_decimal($coupon->minimum_amount, 2),
    'maximum_amount' => wc_format_decimal($coupon->maximum_amount, 2),
    'customer_emails' => $coupon->customer_email,
    'description' => $coupon_post->post_excerpt,
);
if ($coupon_data['code'] != $code) {
    $response['status'] = "failed";
    $response['message'] = "COUPON ".$code." DOES NOT EXIST!";
    return new WP_REST_Response($response);
}
$Acoupon = new WC_Coupon($applied_coupon);
 // print_r($Acoupon);exit();
    if($Acoupon->individual_use == 'yes'){
    $response['status'] = "failed";
    $response['message'] = "SORRY, COUPON ".$applied_coupon." HAS ALREADY BEEN APPLIED AND CANNOT BE USED IN CONJUNCTION WITH OTHER COUPONS.";
    $response['result'] = $Acoupon->individual_use;
    return new WP_REST_Response($response); 
    }
 if ($coupon_data['minimum_amount'] > $cart_amount) {
  $response['status'] = "failed";  
  $response['message'] = "THE MINIMUM SPEND FOR THIS COUPON IS $".$coupon_data['minimum_amount'].".";
  return  new WP_REST_Response($response);
}
if ($coupon_data['maximum_amount'] < $cart_amount) {
  $response['status'] = "failed";  
  $response['message'] = "THE MAXIMUM SPEND FOR THIS COUPON IS $".$coupon_data['maximum_amount'].".";
  return  new WP_REST_Response($response);
}
if ($coupon_data['exclude_sale_items'] == true) {
 $response['status'] = "failed";  
  $response['message'] = "SORRY, THIS COUPON IS NOT VALID FOR SALE ITEMS.";
  return  new WP_REST_Response($response); 
}
$usage_left = $coupon_data['usage_limit'] - $coupon_data['usage_count'];
if ($usage_left == 0) {
    $response['status'] = "failed";  
    $response['message'] = "SORRY, COUPON USAGE LIMIT HAS BEEN REACHED.";
    return  new WP_REST_Response($response);
} 
 $current_time = date('Y-m-d');
 $coupon_Expiry_date = $coupon->expiry_date;
if ($coupon_Expiry_date < $current_time) {
    $response['status'] = "failed";  
    $response['message'] = "THIS COUPON HAS EXPIRED.";
    return  new WP_REST_Response($response);
}
$user_limite = get_post_meta($coupon_data['id'], 'usage_limit_per_user', true);
 $p_id = $coupon_data['id'];
 global $wpdb;
$count_of_per_user = $wpdb->get_results("SELECT * FROM wp_postmeta where post_id = $p_id  and meta_key = '_used_by' and meta_value = $user_id");
$count = count($count_of_per_user);
if ( $count >= $user_limite) {
  $response['status'] = "failed"`enter code here`;  
  $response['message'] = "COUPON USAGE LIMIT HAS BEEN REACHED.";
  return  new WP_REST_Response($response);
}enter code here
else{
  $response['status'] = "Success";  
  $response['message'] = "COUPON APPLIED.";
  return  new WP_REST_Response($response); 
}
}
use this function