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This document uses PHP Chinese website manual Release
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_mul — Multiply numbers
$a
, GMP $b
)
Multiplies a
by b
and returns the result.
a
A number that will be multiplied by b
.
可以是一个 GMP 数据 resouce ,或一个可以转换为数值的字符串。
b
A number that will be multiplied by a
.
可以是一个 GMP 数据 resouce ,或一个可以转换为数值的字符串。
GMP 数值 资源 .
Example #1 gmp_mul() example
<?php
$mul = gmp_mul ( "12345678" , "2000" );
echo gmp_strval ( $mul ) . "\n" ;
?>
以上例程会输出:
24691356000
[#1] [2006-12-06 01:11:24]
<?php
function fact($x)
{
$factorial = 1;
for ($i=2; $i < $x; $i++) {
$factorial = gmp_mul($factorial, $i);
}
return $factorial;
}
echo gmp_strval(fact(1000)) . "\n";
?>