我正在尝试设置访问页面时的产品数量。如果产品不在篮子中，代码可以正常工作并添加正确的数量。然而，如果我有任何东西在篮子里，并刷新它，它会添加另外13个项目。
// add unpaid entries to cart
add_action( \'pre_get_posts\', \'add_entries_to_cart\' );
function add_entries_to_cart() {
global $woocommerce;
// Check we are logged in
if ( is_user_logged_in() ) {
// Check if we are in admin area
if ( ! is_admin() ) {
$user = wp_get_current_user();
$entries = get_user_meta($user->ID, \'entry_count\', true);
$entries_paid = get_user_meta($user->ID, \'paid_entries\', true);
$product_id = 229;
$quantity = $entries - $entries_paid;
$found = false;
//check if product already in cart, get id
if ( sizeof( $woocommerce->cart->get_cart() ) > 0 ) {
foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values ) {
$_product = $values[\'data\'];
if ( $_product->id == $product_id ) {
// correct quantity
unset( $woocommerce->cart->cart_contents[$product_id] );
$woocommerce->cart->add_to_cart( $product_id, $quantity );
$found = true;
}
}
// if product not found, add it
if ( ! $found ) {
$woocommerce->cart->add_to_cart( $product_id, $quantity );
}
}
// no product in cart so add it
else {
// add to cart
$woocommerce->cart->add_to_cart( $product_id, $quantity );
}
}
}
}
最合适的回答,由SO网友:Badger 整理而成
我的代码中有一个错误。从这里开始：http://www.sitepoint.com/woocommerce-actions-and-filters-manipulate-cart/
正在更改
// correct quantity
unset( $woocommerce->cart->cart_contents[$product_id] );
$woocommerce->cart->add_to_cart( $product_id, $quantity );
至
// correct quantity
// Get it\'s unique ID within the Cart
$prod_unique_id = $woocommerce->cart->generate_cart_id( $product_id );
// Remove it from the cart by un-setting it
unset( $woocommerce->cart->cart_contents[$prod_unique_id] );
$woocommerce->cart->add_to_cart( $product_id, $quantity );
已经奏效了。
