gmp_fact() does not work, it returns an error: "Calling an undefined function gmp_fact()".
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_fact — Factorial
numThe factorial number.
A GMP object, an int,
or a string that can be interpreted as a number following the same logic
as if the string was used in gmp_init() with automatic
base detection (i.e. when base is equal to 0).
A GMP object.
Example #1 gmp_fact() example
<?php
$fact1 = gmp_fact(5); // 5 * 4 * 3 * 2 * 1
echo gmp_strval($fact1) . "\n";
$fact2 = gmp_fact(50); // 50 * 49 * 48, ... etc
echo gmp_strval($fact2) . "\n";
?>The above example will output:
120 30414093201713378043612608166064768844377641568960512000000000000