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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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