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run code in 200+ php & hhvm versions
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<?php $r = new stdClass(); $r->a=new stdClass(); $r->a=['test']; var_dump($r);
based on uE8sP
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
object(stdClass)#1 (1) { ["a"]=> array(1) { [0]=> string(4) "test" } }