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run code in 200+ php & hhvm versions
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<?php $f = function () {}; var_dump(get_class($f));
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.2.6
string(7) "Closure"
Output for hhvm-3.15.4
string(53) "Closure$;1106261953$f8120358c918afd5b91ccb6e5880534b$"