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run code in 200+ php & hhvm versions
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<?php $obj = new stdClass; $obj->{'123'} = "foo"; var_dump($obj); $arr = (array) $obj; var_dump($arr);
based on K58ib
Output for 7.2.0
object(stdClass)#1 (1) { ["123"]=> string(3) "foo" } array(1) { [123]=> string(3) "foo" }
Output for 5.0.0 - 7.1.10
object(stdClass)#1 (1) { ["123"]=> string(3) "foo" } array(1) { ["123"]=> string(3) "foo" }
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { [123]=> string(3) "foo" } array(1) { [123]=> string(3) "foo" }