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run code in 150+ php & hhvm versions
Bugs & Features
<?php $obj = (object)array('123' => '456'); var_dump($arr, $arr['123']); var_dump($obj, $obj->{'123'});
based on 0nSt6
Output for 5.2.6 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: arr in /in/cpFgb on line 5 Notice: Undefined variable: arr in /in/cpFgb on line 5 NULL NULL Notice: Undefined property: stdClass::$123 in /in/cpFgb on line 6 object(stdClass)#1 (1) { [123]=> string(3) "456" } NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.4 - 5.2.5
Notice: Undefined variable: arr in /in/cpFgb on line 5 Notice: Undefined variable: arr in /in/cpFgb on line 5 NULL NULL Notice: Undefined property: stdClass::$123 in /in/cpFgb on line 6 object(stdClass)#1 (1) { [123]=> string(3) "456" } NULL
Output for 5.0.0 - 5.0.3
Notice: Undefined variable: arr in /in/cpFgb on line 5 Notice: Undefined variable: arr in /in/cpFgb on line 5 NULL NULL Notice: Undefined property: stdClass::$123 in /in/cpFgb on line 6 object(stdClass)#1 (1) { [123]=> string(3) "456" } NULL
Output for 4.3.0 - 4.4.9
Notice: Undefined variable: arr in /in/cpFgb on line 5 Notice: Undefined variable: arr in /in/cpFgb on line 5 NULL NULL object(stdClass)(1) { [123]=> string(3) "456" } string(3) "456"