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run code in 200+ php & hhvm versions
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<?php class CLASS_A{} $classA = 'CLASS_A'; $c = new \ReflectionClass($classA); var_dump($c->getName());
based on A4KeJ
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
string(7) "CLASS_A"