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run code in 150+ php & hhvm versions
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<?php $x = new stdClass; $x->{'dupa.xx'} = 3; var_dump($x);
Output for 5.0.0 - 7.1.0
object(stdClass)#1 (1) { ["dupa.xx"]=> int(3) }
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { ["dupa.xx"]=> int(3) }