<?php function factorial_of_a_number($n) { if($n ==0) { return 1; } else { return $n * factorial_of_a_number($n-1); } } print_r(factorial_of_a_number(4)); ?> - See more at: http://www.w3resource.com/php-exercises/php-function-exercises.php#sthash.MaMd00mR.dpuf
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