/**
 * Add student data to cart item.
 *
 * @param array $cart_item_data
 * @param int   $product_id
 * @param int   $variation_id
 *
 * @return array
 */
function bsc_add_student_data_to_cart_item( $cart_item_data, $product_id, $variation_id ) {
    $booking_student = filter_input( INPUT_POST, 'booking-student' );

    if ( empty( $booking_student ) ) {
        return $cart_item_data;
    }

    $cart_item_data['booking-student'] = $booking_student;

    return $cart_item_data;
}

add_filter( 'woocommerce_add_cart_item_data', 'bsc_add_student_data_to_cart_item', 10, 3 );

/**
 * Display student data text in the cart.
 *
 * @param array $item_data
 * @param array $cart_item
 *
 * @return array
 */
function bsc_display_student_booking_data_in_cart( $item_data, $cart_item ) {
    if ( empty( $cart_item['booking-student'] ) ) {
        return $item_data;
    }
    $student_object = get_post( $cart_item['booking-student'] );
    $item_data[] = array(
        'key'     => __( 'Student', 'bsc-translation' ),
        'value'   => wc_clean($student_object->post_title),
        'display' => '',
    );

    return $item_data;
}

add_filter( 'woocommerce_get_item_data', 'bsc_display_student_booking_data_in_cart', 10, 2 );

/**
 * Add engraving text to order.
 *
 * @param WC_Order_Item_Product $item
 * @param string                $cart_item_key
 * @param array                 $values
 * @param WC_Order              $order
 */
function bsc_add_student_date_to_order_items( $item, $cart_item_key, $values, $order ) {
    if ( empty( $values['booking-student'] ) ) {
        return;
    }

    $item->add_meta_data( __( 'booking-student', 'bsc-translation' ), $values['booking-student'] );
}

add_action( 'woocommerce_checkout_create_order_line_item', 'bsc_add_student_date_to_order_items', 10, 4 );

/*
* OUTPUT STUDENT NAME INSTEADOF ID IN ITEM DETAILS
*/
function filter_woocommerce_order_item_display_meta_value( $meta_value ) {
    // make filter magic happen here...
    if ( get_post_status ( $meta_value ) ) {
        //return 'test';
        $student = get_post($meta_value);
        if($student->post_type == 'students'){
            $meta_value = $student->post_title;
            return $meta_value;
        } else {
            return $meta_value;
        }
    } else {
        return $meta_value;
    }
};
// add the filter
add_filter( 'woocommerce_order_item_display_meta_value', 'filter_woocommerce_order_item_display_meta_value', 10, 1 );