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<?php $obj = (object)array('123' => '456'); $obj = new stdClass; $obj->{'123'} = '456'; var_dump($obj, $obj->{'123'});
based on ijusL
Output for 5.0.0 - 7.2.0
object(stdClass)#2 (1) { ["123"]=> string(3) "456" } string(3) "456"
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { [123]=> string(3) "456" } string(3) "456"