manipulate data from user in checkout page, safe php code ?

I am new to php, and I am trying to change some of the order details before it is going to data base, I want to make sure that this code is safe,
how it can be checked ?

function update_billing_address_2_from_company( $order_id ) {
    if ( pll_current_language() === 'he' ) {
        $order = wc_get_order( $order_id );
        $billing_company = $order->get_billing_company();
		$first_name  = $order->get_billing_first_name();
        //because of a bug, overwrite billing addres_2
		if (!empty( $billing_company)) {
            $order->set_billing_address_2( $billing_company );
			$order->save();
        }
		//set company name as first name 
		if (!empty( $first_name )){
            $order->set_billing_company( $first_name );
			$order->save();
        }		
    }
}
add_action( 'woocommerce_checkout_update_order_meta', 'update_billing_address_2_from_company', 10, 1 );

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