Binding object instances to static closures
PHP always binds the parent this and scope to newly created closures. The difference between a static closure and a non-static closure is that a static closure has scope (!= NULL) but not this at create time.A "top-level" closure has neither this nor scope.
Therefore, one has to get rid of the scope when creating the closure. Fortunately bindTo allows exactly that, even for static closures:
$m=(new ReflectionMethod('TestClass','testMethod'))->getClosure()->bindTo(null,null);$m();