WooCommerce allow one product in cart and limit the cart to max one product

WooCommerce allow one product in cart and limit the cart to max one product 

 

> Woocommerce allow one product in cart

function woo_cart_ensure_only_one_item( $cart_contents ) {

return array( end( $cart_contents ) );

}

add_filter( 'woocommerce_cart_contents_changed', 'woo_cart_ensure_only_one_item' );

> Limit the Cart to Max One Product – WooCommerce

Using a custom function hooked in woocommerce_add_to_cart_validation filter hook, will allow you to restrict the cart items to 1 max and to display a custom message when this limit is exceeded:

// Checking and validating when products are added to cart

add_filter( 'woocommerce_add_to_cart_validation', 'only_six_items_allowed_add_to_cart', 10, 3 );

function only_six_items_allowed_add_to_cart( $passed, $product_id, $quantity ) {

$cart_items_count = WC()->cart->get_cart_contents_count();

$total_count = $cart_items_count + $quantity;

if( $cart_items_count >= 1 || $total_count > 1 ){

// Set to false

$passed = false;

// Display a message

wc_add_notice( __( "You can’t have more than 1 items in cart", "woocommerce" ), "error" );

}

return $passed;

}

Using a custom function hooked in woocommerce_update_cart_validation filter hook, will allow you to control the cart items quantities update to your 1 cart items limit and to display a custom message when this limit is exceeded:

// Checking and validating when updating cart item quantities when products are added to cart

add_filter( 'woocommerce_update_cart_validation', 'only_six_items_allowed_cart_update', 10, 4 );

function only_six_items_allowed_cart_update( $passed, $cart_item_key, $values, $updated_quantity ) {

$cart_items_count = WC()->cart->get_cart_contents_count();

$original_quantity = $values['quantity'];

$total_count = $cart_items_count - $original_quantity + $updated_quantity;

if( $cart_items_count > 1 || $total_count > 1 ){

// Set to false

$passed = false;

// Display a message

wc_add_notice( __( "You can’t have more than 1 items in cart", "woocommerce" ), "error" );

}

return $passed;

}

Video tutorial: