Need help with class

I want to include class in one php page. However I couldn't get it
working? I didn't get any error message but I didn't get the html page
either. Any one could help me? Thanks.

<?php
function __autoload($class)
{
if (file_exists($file = "$class.php"))
{
include($file);
}
else
{
throw new Exception("Class $class not found");
}
}

try
{
class_exists('pd');
$remo = new pd();

?>
<html>
<head>
</head>
<body>
<div id='div1'>test<br />
<?php
print $remo.test();
print "sssssss";
}
catch (Exception $e)
{
// Catch the exception and handle it as usual
throw new Exception($e->getMessage());
}
?>

</div>
</body>
</html>

pd.php
class pd{
private $dsn;

function _pd() {
$dsn = 'mysql://pd:password@xxxxxxxxx/pd';
}
function test(){
return 2;
}
}
.

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