<?php function fibIter($n) { if ($n < 2) { return $n; } $fibPrev = 0; $fib = 1; foreach (range(1, $n-1) as $i) { list($fibPrev, $fib) = array($fib, $fib + $fibPrev); } return $fib; } function factorial($number) { if ($number < 2) { return 1; } else { return ($number * factorial($number-1)); } } //echo fibIter(20); echo factorial(31); ?>
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