Well, just spell out the namespace in the string:
$definition = Definer::defineProfile($_SESSION['user']->UserType);
$class="\\Editor\\" . $definition;
$foo = new $class();
And if it’s a child namespace (as indicated in the comments), simply prepend the namespace with __NAMESPACE__
:
$class = __NAMESPACE__ . '\\Editor\\' . $definition;
So if the current namespace is \Foo\Bar
, and $definition
is “Baz”, the resulting class would be \Foo\Bar\Editor\Baz