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run code in 150+ php & hhvm versions
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<?php $obj = new stdClass; $obj->{"oink"} = "pig"; var_dump($obj); $objj = new stdClass; $objj->oink = "pig"; var_dump($objj);
based on 5eU0L
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["oink"]=> string(3) "pig" } object(stdClass)#2 (1) { ["oink"]=> string(3) "pig" }
Output for hhvm-3.10.0

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