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run code in 150+ php & hhvm versions
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<?php $a = new stdClass; $b = 'foo'; $a->b = 'bar'; $a->$b = 'baz'; var_dump($a);
Output for 5.0.0 - 7.1.0
object(stdClass)#1 (2) { ["b"]=> string(3) "bar" ["foo"]=> string(3) "baz" }
Output for 4.3.0 - 4.4.9
object(stdClass)(2) { ["b"]=> string(3) "bar" ["foo"]=> string(3) "baz" }