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run code in 150+ php & hhvm versions
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<?php /* class Test { public $123 = '456'; } $t = new Test; echo $t->123; $object = (object) array("123"=>"456"); echo $object->123; */ $object->apple = 'apple'; echo $object->apple,"\n";
based on 5InVg
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Warning: Creating default object from empty value in /in/2P3va on line 13 apple
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.3.29
Strict Standards: Creating default object from empty value in /in/2P3va on line 13 apple
Output for 4.3.0 - 4.4.9
apple