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run code in 200+ php & hhvm versions
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<?php $obj = (object)array('123' => '456'); print_r($obj); echo $obj->{'123'};
based on Fkcmc
Output for 4.3.0 - 4.4.9, 7.2.0
stdClass Object ( [123] => 456 ) 456
Output for 5.2.6 - 7.1.10
stdClass Object ( [123] => 456 ) Notice: Undefined property: stdClass::$123 in /in/Fg1bH on line 5
Output for 5.0.0 - 5.2.5
stdClass Object ( [123] => 456 ) Notice: Undefined property: stdClass::$123 in /in/Fg1bH on line 5