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run code in 150+ php & hhvm versions
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<?php $a = new stdClass; $a->foo = 'bar'; $b = $a; $b->foo = 'baz'; var_dump($a, $b);
Output for 5.0.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["foo"]=> string(3) "baz" } object(stdClass)#1 (1) { ["foo"]=> string(3) "baz" }
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { ["foo"]=> string(3) "bar" } object(stdClass)(1) { ["foo"]=> string(3) "baz" }