<?php // Normal Recusion function factorial1($num) { return $num === 0 ? 1 : $num * factorial1($num - 1); } // Tail Recusion function factorial2($num) { return factorialIter($num, 1); } // Tail Recusion Helper function factorialIter($num, $acc) { return $num === 0 ? $acc : factorialIter($num - 1, $acc * $num); } echo "<pre>"; $no = 100 ; echo factorial1($no), PHP_EOL; echo factorial2($no), PHP_EOL; ?>
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