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<?php $fibonnacci = function (int $n, $previous2 = 0, $previous1 = 1) { if ($n <= 1) { return $previous2 + $previous1; } $closure = Closure::getCurrent(); return $closure($n - 1, $previous1, $previous1 + $previous2); }; print $fibonnacci(4);
Output for git.master_jit, git.master
5

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