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run code in 150+ php & hhvm versions
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<?php $obj = (object)array('123' => '456'); var_dump($obj); var_dump($obj->{'123'}); var_dump($obj->{123});
based on TVDP8
Output for 5.2.6 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { [123]=> string(3) "456" } Notice: Undefined property: stdClass::$123 in /in/dTMjM on line 5 NULL Notice: Undefined property: stdClass::$123 in /in/dTMjM on line 6 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.5
object(stdClass)#1 (1) { [123]=> string(3) "456" } Notice: Undefined property: stdClass::$123 in /in/dTMjM on line 5 NULL Notice: Undefined property: stdClass::$123 in /in/dTMjM on line 6 NULL
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/dTMjM on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.2
object(stdClass)(1) { [123]=> string(3) "456" } string(3) "456"
Process exited with code 139.