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run code in 200+ php & hhvm versions
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<?php function f($a, $b = 'default') { var_dump($a, $b); echo PHP_EOL; } f('hi'); f('hi', null);
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0alpha1
string(2) "hi" string(7) "default" string(2) "hi" NULL