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run code in 150+ php & hhvm versions
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<?php $obj = new stdClass(); $obj->{'456'} = "foo"; $obj->{123} = "bar"; $obj->{true} = "true"; $arr = (array)$obj; var_dump($arr); var_dump($arr['123'], $arr[123]); var_dump($arr['456'], $arr[456]);
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
array(3) { ["456"]=> string(3) "foo" ["123"]=> string(3) "bar" ["1"]=> string(4) "true" } Notice: Undefined offset: 123 in /in/6sfFR on line 11 Notice: Undefined offset: 123 in /in/6sfFR on line 11 NULL NULL Notice: Undefined offset: 456 in /in/6sfFR on line 12 Notice: Undefined offset: 456 in /in/6sfFR on line 12 NULL NULL
Output for hhvm-3.10.0 - 3.12.0
array(3) { ["456"]=> string(3) "foo" ["123"]=> string(3) "bar" ["1"]=> string(4) "true" } Notice: Undefined index: 123 in /in/6sfFR on line 11 Notice: Undefined index: 123 in /in/6sfFR on line 11 NULL NULL Notice: Undefined index: 456 in /in/6sfFR on line 12 Notice: Undefined index: 456 in /in/6sfFR on line 12 NULL NULL
Output for 5.3.0 - 5.3.29
array(3) { ["456"]=> string(3) "foo" ["123"]=> string(3) "bar" ["1"]=> string(4) "true" } Notice: Undefined index: 123 in /in/6sfFR on line 11 Notice: Undefined offset: 123 in /in/6sfFR on line 11 NULL NULL Notice: Undefined index: 456 in /in/6sfFR on line 12 Notice: Undefined offset: 456 in /in/6sfFR on line 12 NULL NULL
Output for 5.0.0 - 5.2.17
array(3) { ["456"]=> string(3) "foo" ["123"]=> string(3) "bar" ["1"]=> string(4) "true" } Notice: Undefined index: 123 in /in/6sfFR on line 11 Notice: Undefined offset: 123 in /in/6sfFR on line 11 NULL NULL Notice: Undefined index: 456 in /in/6sfFR on line 12 Notice: Undefined offset: 456 in /in/6sfFR on line 12 NULL NULL
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/6sfFR on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.