<?php
$dbh = new PDO('sqlite:test.db','', '');
$stmt = $dbh->prepare("INSERT INTO REGISTRY (name, value) VALUES (:name, :value)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':value', $value);
// insert a line
$name = 'one';
$value = 1;
$stmt->execute();
?>


When I execute this code, an error like this

Fatal error: Call to a member function bindParam() on a non-object in C:\xampp\htdocs\1.php on line 4

apperes. Why?

Probably because $dbh->prepare(); doesn't return an object reference, so you can't call a member function.
I'd say this is because $dbh->prepare(); fails in some way and returns an error.

I'd say the problem is with your call to the PDO constructor.

Here's the code I use to create a db connection, just change the variables to the appropriate values.

PHP Code:

function pdoConnect($persistent = true)
{
    $dbuser = 'yourUsername';
    $dbpass = 'yourPassword';
    $dbhost = 'localhost';
    $dbname = 'yourDBName';
    $dbtype = 'mysql';

    try
    {
        if ($persistent)
        {
            $dbh = new PDO($dbtype.':host='.$dbhost.';dbname='.$dbname, $dbuser,
                $dbpass, array(PDO::ATTR_PERSISTENT => true));
            return $dbh;
        }
        else
        {
            $dbh = new PDO($dbtype.':host='.$dbhost.';dbname='.$dbname, $dbuser,
                $dbpass);
            return $dbh;
        }
    }
    catch (PDOException$e)
    {
        return false;
    }
}