gmp_fact()

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

Factorial

说明

Calculates factorial(a!)of$a.

参数

The factorial number.

可以是一个 GMP数据resouce，或一个可以转换为数值的字符串。

返回值

GMP 数值资源.

范例

gmp_fact() example

以上例程会输出：

120
30414093201713378043612608166064768844377641568960512000000000000

I was expecting gmp_fact() is more effective than doing a while loop, but measurements show opposite:

WILL OUTPUT:
LOOP (0.000022s):
1.9745068572211E+182
GMP FACT (0.000132s):
1.9745068572211E+182
Result is 0.000022s loop, and 0.000132s gmp_fact()

I was expecting gmp_fact() is more effective than doing a while loop, but measurements show opposite:

WILL OUTPUT:
LOOP (0.000022s):
1.9745068572211E+182
GMP FACT (0.000132s):
1.9745068572211E+182
Result is 0.000022s loop, and 0.000132s gmp_fact()

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