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I have setup a WooCommerce shop for sell Ticket for a Dancing Workshop. Everthing is ok, but i will delete Tickets from cart if somebody puts 2 Tickets for Workshops that are at the same time.

Example: I have made 10 Tickets for the courses.

• 5 for Trainer A with Name A1 - A5
• 5 for Trainer B with Name B1 - B5.

Now when somebody add A1 to cart he cannot use the same Time Course B1.

I use the following code, this only works for 1 product

add_action( 'woocommerce_add_to_cart', 'check_product_added_to_cart', 10, 6 );
function check_product_added_to_cart($cart_item_key, $product_id, $quantity, $variation_id, $variation, $cart_item_data) {

    // Set HERE your targeted product ID
    $target_product_id = 31;
    // Set HERE the  product ID to remove
    $item_id_to_remove = 37;

    // Initialising some variables
    $has_item = false;
    $is_product_id = false;

    foreach( WC()->cart->get_cart() as $key => $item ){
        // Check if the item to remove is in cart
        if( $item['product_id'] == $item_id_to_remove ){
            $has_item = true;
            $key_to_remove = $key;
        }

        // Check if we add to cart the targeted product ID
        if( $product_id == $target_product_id ){
            $is_product_id = true;
        }
    }

    if( $has_item && $is_product_id ){
        WC()->cart->remove_cart_item($key_to_remove);

        // Optionaly displaying a notice for the removed item:
        wc_add_notice( __( 'The product "blab bla" has been removed from cart.', 'theme_domain' ), 'notice' );
    }
}

Someone who can explain how this code should be modified?

Answers

Following code works with corresponding products, if one product id is present, then the corresponding product id is removed from cart.

UPDATE: 12/20 - improved code

function action_woocommerce_add_to_cart( $cart_item_key, $product_id, $quantity, $variation_id, $variation, $cart_item_data ) {
    // (USE: PRODUCT_IDs) - the corresponding product id's
    // Example: if product with ID 30 is added and product with ID 32 is in cart, product with ID 32 will be removed from cart, this also works the opposite    
    $associated_product_ids_arrays = array(
        array(
            'product_id_1' => '30',
            'product_id_2' => '32',
        ), 
        array(
            'product_id_1' => '817',
            'product_id_2' => '819',
        ), 
        array(
            'product_id_1' => '827',
            'product_id_2' => '843',
        ), 
    );
    
    // check
    $found = false;
    
    // Loop trough arrays
    foreach ( $associated_product_ids_arrays as $key_1 => $associated_product_ids_array ) {
        foreach ( $associated_product_ids_array as $key_2 => $associated_product_ids ) {
            // Compare
            if ( $associated_product_ids == $product_id ) {
                // Unset
                unset( $associated_product_ids_array[$key_2] );
                
                // Convert last value in array to integer
                $associated_ticket_id = (int) implode('', $associated_product_ids_array );
                
                // Found = true, break 2 loops
                $found = true;
                break 2;
            }
        }
    }
    
    // True
    if ( $found ) {
        // Generate a unique ID for the cart item
        $product_cart_id = WC()->cart->generate_cart_id( $associated_ticket_id );
        
        // Check if product is in the cart and return cart item key
        $item_key = WC()->cart->find_product_in_cart( $product_cart_id );
        
        // if item_key true
        if ( $item_key ) {
            // remove product from cart
            WC()->cart->remove_cart_item( $item_key );
            
            // Optionaly displaying a notice
            wc_add_notice( sprintf( __( 'The product %d has been removed from cart because product %d has been added.', 'woocommerce' ), $associated_ticket_id, $product_id ), 'notice' );
        }
    }
}
add_action( 'woocommerce_add_to_cart', 'action_woocommerce_add_to_cart', 10, 6 );

Answer from 03/20

function product_to_remove( $cart_item_key, $product_id, $quantity, $variation_id, $variation, $cart_item_data ) {
    // (USE: PRODUCT_IDs) - the corresponding ticket id's
    $associated_ticket_ids_1 = array( 30, 32 );
    $associated_ticket_ids_2 = array( 817, 819 );
    $associated_ticket_ids_3 = array( 827, 843 );
    // etc...
    
    // total of associated ticket ids arrays, total = number of different $associated_ticket_ids arrays, in this example: 3
    $total = 3;
    
     // check
    $found = false;
    
     // loop through the arrays
    for ($i = 1; $i <= $total; $i++) {
        $array_name = ${'associated_ticket_ids_' . $i};
        
        foreach ($array_name as $ticket_id ) {
            if ( $ticket_id == $product_id ) {
                /* Get the associated ticket id */
                // Search value and unset
                unset( $array_name[array_search( $ticket_id, $array_name )] );
                
                // Convert last value in array to integer
                $associated_ticket_id = (int) implode('', $array_name);
                
                // if found, break loops
                $found = true;
                break 2;
                
                 /* uncomment line below for debug purposes */
                //echo 'Product id: ' . $product_id . ' | Ticket id: ' . $ticket_id . ' | Associated ticket id: ' . $associated_ticket_id;
            }
        }
    }
    
    // if found true
    if ( $found ) {
        // Generate a unique ID for the cart item
        $product_cart_id = WC()->cart->generate_cart_id( $associated_ticket_id );
        
        // Check if product is in the cart and return cart item key
        $item_key = WC()->cart->find_product_in_cart( $product_cart_id );
        
        // if item_key true
        if ( $item_key ) {
            // remove product from cart
            WC()->cart->remove_cart_item( $item_key );
            
            // Optionaly displaying a notice
            wc_add_notice( __( 'The product ' . $associated_ticket_id . ' has been removed from cart because product ' . $product_id . ' has been added.', 'woocommerce' ), 'notice' );
        }
    }
}
add_action( 'woocommerce_add_to_cart', 'product_to_remove', 10, 6 );