woocommerce add custom field data to cart page
add_filter( "woocommerce_add_cart_item_data", "cs_add_cart_item_data", 10,2 );
function cs_add_cart_item_data( $cart_item, $product_id ){
/*
Custom Field name="" attr
*/
if ( isset($_POST['custom_field_name']) ) {
$cart_item['custom_field_name'] = sanitize_text_field( $getRawVal );
}
return $cart_item;
}