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run code in 150+ php & hhvm versions
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<?php $obj = new stdClass(); $obj->{123} = "foo"; $arr = (array)$obj; var_dump($arr); var_dump($arr['123'], $arr[123]); $obj2 = (object)$arr; var_dump($obj2->{123});
based on jfJ1g
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
array(1) { ["123"]=> string(3) "foo" } Notice: Undefined offset: 123 in /in/4jBF5 on line 9 Notice: Undefined offset: 123 in /in/4jBF5 on line 9 NULL NULL string(3) "foo"
Output for hhvm-3.12.0
array(1) { ["123"]=> string(3) "foo" } Notice: Undefined index: 123 in /in/4jBF5 on line 9 Notice: Undefined index: 123 in /in/4jBF5 on line 9 NULL NULL string(3) "foo"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
array(1) { ["123"]=> string(3) "foo" } Notice: Undefined index: 123 in /in/4jBF5 on line 9 Notice: Undefined offset: 123 in /in/4jBF5 on line 9 NULL NULL string(3) "foo"
Output for 5.0.0 - 5.2.17
array(1) { ["123"]=> string(3) "foo" } Notice: Undefined index: 123 in /in/4jBF5 on line 9 Notice: Undefined offset: 123 in /in/4jBF5 on line 9 NULL NULL string(3) "foo"
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/4jBF5 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.