<?php
function fact($x)
{
$factorial = 1;
for ($i=2; $i < $x; $i++) {
$factorial = gmp_mul($factorial, $i);
}
return $factorial;
}
echo gmp_strval(fact(1000)) . "\n";
?>
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_mul — Multiply numbers
a
A number that will be multiplied by b.
Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
b
A number that will be multiplied by a.
Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
Example #1 gmp_mul() example
<?php
$mul = gmp_mul("12345678", "2000");
echo gmp_strval($mul) . "\n";
?>
The above example will output:
24691356000
<?php
function fact($x)
{
$factorial = 1;
for ($i=2; $i < $x; $i++) {
$factorial = gmp_mul($factorial, $i);
}
return $factorial;
}
echo gmp_strval(fact(1000)) . "\n";
?>