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run code in 150+ php & hhvm versions
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<?php function f($one = null, $two = null) { var_dump($one, $two); } f($two = 'foo'); var_dump($two);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(3) "foo" NULL string(3) "foo"