(PHP 4 >= 4.0.4, PHP 5, PHP 7)
Factorial
GMP gmp_fact ( mixed $a )
Calculates factorial (a!) of a.
Parameters:
a
The factorial number.
Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
Returns:
A GMP number resource in PHP 5.5 and earlier, or a GMP object in PHP 5.6 and later.
Examples:
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
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