致命错误mysql PHP

Question

I am trying to use php to insert data into my mysql database. When i do this, i get the error message : Catchable fatal error: Object of class mysqli_result could not be converted to string in order_handle.php on line 145.

Here is line 144-152;

$payment_date = $year."-".$month_number."-".$day;
$insert_ho = "insert into shirt_orders (order_total, payment_date, shirt_credit_cards_id, shirt_shipping_addresses_id, shirt_billing_addresses_id, shirt_shipping_methods_id) values ('$order_total', '$payment_date', '$shirt_credit_cards_id', '$shirt_shipping_addresses_id', '$shirt_billing_addresses_id', '$shirt_shipping_methods_id')";
$exec_insert_ho = @mysqli_query($link, $insert_ho);
if (!$exec_insert_ho) {
    rollback_die("The insertion into shirt_orders was unsuccessful because: ".mysqli_error($link));
} else {
    $shirt_orders_id = mysqli_insert_id($link);
    $insert_gut = "insert into shirt_users_types (shirt_users_id, shirt_orders_id, type_quantity, type_total) values ($shirt_users_id, '$shirt_orders_id', '$qty', '$order_total')";
    $exec_insert_gut = @mysqli_query($link, $insert_gut);

Im not quite sure what the error is for. I have reviewed several other questions on the site similar to this but none really have addressed anything similar. any help would be great!

Answer 1

I think the error is in the data. Do you have an example of the data that triggers the error? What happens if you run the query in mysql client?