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run code in 150+ php & hhvm versions
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<?php function nest($v, $prefix = 'in-') { function f($v, $prefix) { return $prefix . $v; }; echo f($v, $prefix); } nest('down'); echo f('global', 'f is ');
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
in-downf is global