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<?php var_dump(${''}='stdClass'); var_dump(new ${!${''}='stdClass'});
Output for 5.0.0 - 7.1.0
string(8) "stdClass" object(stdClass)#1 (0) { }
Output for 4.3.0 - 4.4.9
string(8) "stdClass" object(stdClass)(0) { }