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run code in 150+ php & hhvm versions
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<?php $obj = (object) array('123' => 456); var_dump($obj); echo $obj->{'123'};
based on bTuZ2
Output for 5.2.6 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { [123]=> int(456) } Notice: Undefined property: stdClass::$123 in /in/nVsW9 on line 4
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.5
object(stdClass)#1 (1) { [123]=> int(456) } Notice: Undefined property: stdClass::$123 in /in/nVsW9 on line 4
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { [123]=> int(456) } 456