save data in cart session in woocommerce code example

Example: Woocommerce Update the Order meta with Custom Field value [Custom Field Display 1]

/**
 * Update the order meta with field value
 *
 * PHP Custom Feild Value
 * 
 * 
 */

add_action( 'woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta' );
function my_custom_checkout_field_update_order_meta( $order_id ) {
    if ( ! empty( $_POST['store_location'] ) ) {
        update_post_meta( $order_id, 'My Field', sanitize_text_field( $_POST['store_location'] ) );
    }
}