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run code in 150+ php & hhvm versions
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<?php $obj = new stdClass; $obj->{(string) "123"} = "foo"; $arr = (array) $obj; var_dump($arr[123]); // Undefined offset: 123 var_dump($arr["123"]); // Undefined offset: 123
based on iiNYs
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: 123 in /in/hWQu9 on line 5 NULL Notice: Undefined offset: 123 in /in/hWQu9 on line 6 NULL
Output for hhvm-3.12.0
Notice: Undefined index: 123 in /in/hWQu9 on line 5 NULL Notice: Undefined index: 123 in /in/hWQu9 on line 6 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
Notice: Undefined offset: 123 in /in/hWQu9 on line 5 NULL Notice: Undefined index: 123 in /in/hWQu9 on line 6 NULL
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.2.17
Notice: Undefined offset: 123 in /in/hWQu9 on line 5 NULL Notice: Undefined index: 123 in /in/hWQu9 on line 6 NULL
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/hWQu9 on line 6
Process exited with code 255.
Output for 4.3.0 - 4.4.9
string(3) "foo" string(3) "foo"