PHP CLASSES AND IF/ELSE BLOCK

//*********************************working
$flag='3';

if($flag=='3')
{
class cc {
function __construct() {
echo 'cc!';

}
}

}

$type = 'cc';
$obj = new $type;
//****************************************not working

$type = 'cc';
$obj = new $type;
$flag='3';

if($flag=='3')
{
class cc {
function __construct() {
echo 'cc!';

}
}

}


?>