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PHP Manual

This manual is provided as a courtesy. It is not an official source. Please check php.net for updated information.

PHP Manual

PHP Manual
PHP Manual
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gmp_fact

(PHP 4 >= 4.0.4, PHP 5)

gmp_fact -- Factorial

Description

resource gmp_fact ( int a )

Calculates factorial (a!) of a.

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 printout of the above program will be: 

120
30414093201713378043612608166064768844377641568960512000000000000
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