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run code in 150+ php & hhvm versions
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<?php $object = new StdClass(); $object->{1} = 'test'; /** * object(stdClass)#1 (1) { * ["1"]=> * string(4) "test" * } */ $array = (array) $object; /** * array(1) { * ["1"]=> * string(4) "test" * } */ var_dump($object); // NULL var_dump($array); // NULL
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["1"]=> string(4) "test" } array(1) { ["1"]=> string(4) "test" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/iVmC4 on line 23
Process exited with code 255.
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/iVmC4 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.