Help needed with bindparam

[nofel]

hey all i am getting an error which says
Fatal error: Call to a member function bindParam() on a non-object
my code is as follows for bind

  /*** bind the params ***/
        $stmt->bindParam(1, $type);
        $stmt->bindParam(2, $imgfp, PDO::PARAM_LOB);
        $stmt->bindParam(3, $size);
        $stmt->bindParam(4, $name);

can anyone help me

[Salathe]

Show us the line where $stmt is assigned a value ($stmt = …).

[nofel]

 /*** our sql query ***/
        $stmt = $dbh->prepare("INSERT INTO testblob (image_type ,image, image_size, image_name) VALUES (? ,?, ?, ?)");
 
        /*** bind the params ***/
        $stmt->bindParam(1, $type);
        $stmt->bindParam(2, $imgfp, PDO::PARAM_LOB);
        $stmt->bindParam(3, $size);
        $stmt->bindParam(4, $name);
 
        /*** execute the query ***/
        $stmt->execute();
        }
    else
        {
        /*** throw an exception is image is not of type ***/
        throw new Exception("File Size Error");
        }
    }
else
    {
    // if the file is not less than the maximum allowed, print an error
    throw new Exception("Unsupported Image Format!");
    }
}
?>

[crmalibu]

print_r($dbh->errorInfo());