Woocommerce Sessions: woocommerce_get_cart_item_from_session

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I have created a plugin mainly following this guide, which simply adds a small bit of data to a given product.

I know Woocommerce have made some changes outlined here.

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The problem I’m having is that when I add my item to the cart, and access the cart page, I am getting a blank screen. I believe the problem stems from the use of this filter:

add_filter(‘woocommerce_get_cart_item_from_session’…

If I comment the line with this filter, my checkout page works (but without the extra details added to my product). I can’t work out why this filter is not working, or what problem it is having??

The woocommerce changes said:

WooCommerce 2.0 no longer uses the PHP session_start function, instead it makes use of WordPress’ transients, which is great, unless your code happens to rely on $_SESSION.

I’m not starting any new sessions as far as I can see (my code is 90% the same as the first link). Maybe this is a problem with my server? Any ideas?

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  1. i was browsing a lot and i recommend that you read the following:

    The solution is to hook in there and also restore your custom cart item data.

    Example Code:

    add_filter( 'woocommerce_add_cart_item_data', function ( $cartItemData, $productId, $variationId ) {
    $cartItemData['myCustomData'] = 'someCustomValue';

    return $cartItemData;
}, 10, 3 );

add_filter( 'woocommerce_get_cart_item_from_session', function ( $cartItemData, $cartItemSessionData, $cartItemKey ) {
    if ( isset( $cartItemSessionData['myCustomData'] ) ) {
        $cartItemData['myCustomData'] = $cartItemSessionData['myCustomData'];
    }

    return $cartItemData;
}, 10, 3 );
To also show the data at the cart/checkout page you can use the following code:

add_filter( 'woocommerce_get_item_data', function ( $data, $cartItem ) {
    if ( isset( $cartItem['myCustomData'] ) ) {
        $data[] = array(
            'name' => 'My custom data',
            'value' => $cartItem['myCustomData']
        );
    }

    return $data;
}, 10, 2 );

    The final thing now is to save the data when the order is made:

    add_action( 'woocommerce_add_order_item_meta', function ( $itemId, $values, $key ) {
    if ( isset( $values['myCustomData'] ) ) {
        wc_add_order_item_meta( $itemId, 'myCustomData', $values['myCustomData'] );
    }
}, 10, 3 );

    You dont have to do anything else the show the data inside the backend, all order item meta data gets display automatically.

    this is from

    How to retrieve cart_item_data with WooCommerce?

    you have to add this stuff to the functions.php file of your theme for example.