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<?php class TestIgor { public function __construct() { throw new \RuntimeException("test"); } } var_dump(unserialize('O:8:"TestIgor":0:{}'));
based on qIiQM
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
object(TestIgor)#1 (0) { }