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run code in 150+ php & hhvm versions
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<?php $obj1 = new stdClass(); $obj1->test = 'hoi'; $arr = array($obj1); foreach ($arr as $obj) { $obj->test = 'doeii!!'; } var_dump($obj1);
based on 1JV3v
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["test"]=> string(7) "doeii!!" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { ["test"]=> string(3) "hoi" }