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gmp_fact

Factorial (PHP 4 >= 4.0.4, PHP 5)
resource gmp_fact ( int a )

Calculates factorial (a!) of a.

Parameters

a

The factorial number.

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

Return Values

A GMP number resource.

Examples

Example 790. 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