gmp_sub
(PHP 4 >= 4.0.4, PHP 5)
gmp_sub — Subtract numbers
说明
resource gmp_sub
( resource $a
, resource $b
)
Subtracts b from a and returns the result.
参数
- a
-
The number being subtracted from.
It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
- b
-
The number subtracted from a .
It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
返回值
A GMP number resource.
范例
Example#1 gmp_sub() example
<?php
$sub = gmp_sub("281474976710656", "4294967296"); // 2^48 - 2^32
echo gmp_strval($sub) . "\n";
?>
上例将输出：
281470681743360
