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run code in 150+ php & hhvm versions
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<?php $o1 = new stdClass(); $o1->clr = 'blue'; $o3 = $o1; $o3->clr = 'red'; var_dump($o3,$o1);
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) { ["clr"]=> string(3) "red" } object(stdClass)#1 (1) { ["clr"]=> string(3) "red" }
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { ["clr"]=> string(3) "red" } object(stdClass)(1) { ["clr"]=> string(4) "blue" }