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<?php $arr = array('123' => '456'); $obj = (object)$arr; var_dump($obj, $obj->{'123'});
based on SNE8H
Output for 5.2.6 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Notice: Undefined property: stdClass::$123 in /in/nLE4G on line 6 object(stdClass)#1 (1) { [123]=> string(3) "456" } NULL
Output for 5.0.0 - 5.2.5
Notice: Undefined property: stdClass::$123 in /in/nLE4G on line 6 object(stdClass)#1 (1) { [123]=> string(3) "456" } NULL
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { [123]=> string(3) "456" } string(3) "456"