I forgot to mention. You need (obviously) to remove the gmp function for a usual one. Like this:
function fact($num)
{
$res = 1;
for ($n = $num; $n >= 1; $n--)
$res = $res*$n;
return $res;
}
Example #1 Factorial function using GMP
<?php
function fact($x)
{
$return = 1;
for ($i=2; $i <= $x; $i++) {
$return = gmp_mul($return, $i);
}
return $return;
}
echo gmp_strval(fact(1000)) . "\n";
?>
This will calculate factorial of 1000 (pretty big number) very fast.
I forgot to mention. You need (obviously) to remove the gmp function for a usual one. Like this:
function fact($num)
{
$res = 1;
for ($n = $num; $n >= 1; $n--)
$res = $res*$n;
return $res;
}