$success = true; try { $testRestrictedSet->remove(2); } catch (\Exception $e) { $success = false; } if ($success) { echo "Success!\n"; } else { echo "Failure...\n"; } echo "\nSet Internals -- \n"; var_dump($testRestrictedSet->getArray()); echo "\nIs 1 In Set? "; try { if ($testRestrictedSet->in(1)) { echo "Yes\n"; } else { echo "No\n"; } } catch (\Exception $e) { echo "EXCEPTION CAUGHT\n"; } echo "Is Set Empty? "; try { if ($testRestrictedSet->isEmpty()) { echo "Yes\n"; } else { echo "No\n"; } } catch (\Exception $e) {