gmp_fact
(PHP 4 >= 4.0.4, PHP 5)
gmp_fact -- Factorial
Description
resource
gmp_fact ( int a)
Calculates factorial (a!) of a.
例子 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";
?>
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The printout of the above program will be:
120
30414093201713378043612608166064768844377641568960512000000000000 |
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