Fatal error cropped: stdClass object cannot be converted to string in ... after trying to insert into database

Question

I found similar queries similar to mine in stackoverflow, but did not find solutions. So I ask again. I have the following query insert:

$purchase_date = date("Y-m-d");

    $init = substr($info[fname], 0, 2);
    $odr = rand(0,255);

    $invoice_number = $this->get_invoice_number();

    //$invoice_number = $invoice_number+1;
    //$invoice_number = 400 + rand(0,100);
    $order_number = $init.'-'.$odr;


    $session_id = session_id();

    $sql = "
        INSERT INTO
            tbl_checkout
        SET
            fname = '$info[fname]',
            lname = '$info[lname]',
            email = '$info[email]',
            phone = '$info[phone]',
            address = '$info[address]',
            pin = '$info[pin]',
            session_id = '$session_id',
            purchase_date = '$purchase_date',
            invoice_number = '$invoice_number',
            order_number = '$order_number'             <----This is line no 1038
    ";
    $this->db->insertQuery($sql);

But when I tried to execute it, it shows an error, for example Catchable fatal error: Object of class stdClass could not be converted to string in c:\.....on line 1038

I got lost because I can’t even understand what the error means! Please, help.

Answer 1

$this->get_invoice_number()probably returns an object.

you can pass it to the line:

$invoice_number = (string) $this->get_invoice_number();

Answer 2

There is nothing wrong with line 1038,
most likely line 1037 with an error
(a valuable casting problem)

$invoice_number = $this->get_invoice_number();

You have to do

var_dump( $this->get_invoice_number() );

, , ,

$invoice_number->SOME_PROPERTY;