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run code in 150+ php & hhvm versions
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<?php function f($req, $opt = null) { printf('$req: %d; $opt: %d."\n"', $req, $opt); } f(1); f(1, 2); ?>
Output for 4.3.0 - 7.1.0
$req: 1; $opt: 0."\n"$req: 1; $opt: 2."\n"