Empty cart upon page load allowing add to cart in WooCommerce

Question

In WooCommerce, I'm trying to create a one-page landing page with a product and checkout.

When the page is loaded I want the cart to empty. But I want to be able to add to cart, and checkout on the same page.

I want to achieve this only on pages with a specific page-template.

I'm working from Clear Woocommerce Cart on Page Load Even for logged in users answer code.

This is what I have:

?>
<?php 
//epmty cart
if (! WC()->cart->is_empty() ) {
    WC()->cart->empty_cart( true );
}
<?php 
// show add to cart button
echo do_shortcode( '[add_to_cart id='22']');
?>
// allow checkout Even though Cart Is Empty
add_filter( 'woocommerce_checkout_redirect_empty_cart', '__return_false' );
add_filter( 'woocommerce_checkout_update_order_review_expired', '__return_false' );
?>
<?php 
echo do_shortcode( '[woocommerce_checkout' );
?>

The problem I think is that the page refreshes upon add to cart and therefor empties the cart again. How do I make it run only once? or is there a better way to clear the cart?

I haven't found yet the way to restrict that for only a custom template page… — LoicTheAztec, Jul 08 '20 at 15:38
Updated my answer… You can try that or use my answer new way… I hope it will work. — LoicTheAztec, Jul 08 '20 at 16:55

LoicTheAztec · Accepted Answer · 2020-07-08T20:52:18.983

Update 2

You could try the following code in your template:

$current_product_id = 22; // The product ID 
$cart               = WC()->cart; // The WC_Cart Object

// When cart is not empty 
if ( ! $cart->is_empty() ) {
    // Loop through cart items
    foreach( $cart->get_cart() as $cart_item_key => $cart_item ) {
        // If the cart item is not the current defined product ID
        if( $current_product_id != $cart_item['product_id'] ) {
            $cart->remove_cart_item( $cart_item_key ); // remove it from cart
        }
    }
} 
// When cart is empty
else {
    // allow checkout Event
    add_filter( 'woocommerce_checkout_redirect_empty_cart', '__return_false' );
    add_filter( 'woocommerce_checkout_update_order_review_expired', '__return_false' );
}

// show add to cart button
echo do_shortcode( "[add_to_cart id='22']");

// show Checkout
echo do_shortcode( "[woocommerce_checkout]" );

Great - but since functions.php is general I'd need to make "// Keep only last item added to cart" conditional to a specific page template. Is this posible? — tiny, Jul 08 '20 at 15:26
@tiny Update 2 … I found another way that could work… Try it and told me. — LoicTheAztec, Jul 08 '20 at 16:54

Empty cart upon page load allowing add to cart in WooCommerce

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