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<?php $obj = (object)array(array('123' => '456')); var_dump($obj);
based on 0HfCE
Output for 7.2.0
object(stdClass)#1 (1) { ["0"]=> array(1) { [123]=> string(3) "456" } }
Output for 5.0.0 - 7.1.10
object(stdClass)#1 (1) { [0]=> array(1) { [123]=> string(3) "456" } }
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { [0]=> array(1) { [123]=> string(3) "456" } }