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run code in 150+ php & hhvm versions
Bugs & Features
<?php $obj = new stdClass; $obj->{123} = '456'; var_dump($obj);
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["123"]=> string(3) "456" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/OfkGY on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.