Catchable fatal error: Object of class stdClass could not be converted to string in <filename> on line <line>

["Max Thayer" <mthayer@xxxxxxxxxxxxxxx>]

************************************************************************
****

**************************************************

Catchable fatal error: Object of class stdClass could not  be converted
to string in <filename> on line <line>

************************************************************************
****

**************************************************

I can only find the change log for PHP 5.2 identifying this type of
error, nothing on how to fix it.  I have updated PHP to 5.2.3 on Apache
2.2.x on a BSD Box 6.x  If some one could explain to me what I am doing
wrong, and what I need to do to fix it that would be swell.

A point of note is that my $dbh is being created in my class constructor
as a private.  The method that is calling the prepare and execute
statements is a public.  I don't thing I'm trying to do anything new or
exotic, I don't think I'm trying to convert the object to a string, just
execute the query statement....

                        $begin = $this->dbh->beginTransaction();

                        if (!$begin) throw new HWIException(ERR0023,23);

                        $outdc = "";

                        $outliid = "";

                        $prep_users = $this->dbh->prepare($sql_users);

                        if (!$prep_users) {

                                $msg = $this->dbh->errorInfo();

                                throw new HWIException(ERR0021 . " " .

$msg[2], 21);

                        }

                        $prep_users->bindParam(':username',

$this->userObj->hwi_username,

PDO::PARAM_STR, 16);

                        $prep_users->bindParam(':title',
$this->userObj->hwi_title, PDO::PARAM_STR, 4);

                        $prep_users->bindParam(':firstname',

$this->userObj->hwi_firstname,

PDO::PARAM_STR, 30);

                        $prep_users->bindParam(':midinit',

$this->userObj->hwi_midinit,

PDO::PARAM_STR, 1);

                        $prep_users->bindParam(':lastname',

$this->userObj->hwi_lastname,

PDO::PARAM_STR, 45);

                        $prep_users->bindParam(':priphone',

$this->userObj->hwi_priphone,

PDO::PARAM_STR, 30);

                        $prep_users->bindParam(':priext',
$this->userObj->hwi_priext, PDO::PARAM_STR, 10);

                        $prep_users->bindParam(':secphone',

$this->userObj->hwi_secphone,

PDO::PARAM_STR, 30);

                        $prep_users->bindParam(':secext',
$this->userObj->hwi_secext, PDO::PARAM_STR, 10);

                        $prep_users->bindParam(':fax',
$this->userObj->hwi_fax, PDO::PARAM_STR, 30);

                        $prep_users->bindParam(':isPI',
$this->userObj->hwi_ispi, PDO::PARAM_INT);

                        $prep_users->bindParam(':date_returned', $outdc,
PDO::PARAM_STR);

                        $prep_users->bindParam(':liid', $outliid,
PDO::PARAM_STR);

#####################   PROBLEM LINE OF CODE ###################

                        $exec = $prep_users->execute();
#################################################################

                        if(!$exec) {

                                $msg = $prep_users->errorInfo();

                                throw new HWIException(ERR0022 . " " .

$msg[2], 22);

                        }


Max H. Thayer
Software Developer
Center for High-Throughput Structural Biology
 
Hauptman-Woodward Medical Research Inst.
700 Ellicott St.
Buffalo, NY 14203
Phone: 716-898-8637
Fax: 716-898-8660
http://www.chtsb.org <http://www.chtsb.org/> 
http://www.hwi.buffalo.edu <http://www.hwi.buffalo.edu/>