gmp_sub

(PHP 4 >= 4.0.4, PHP 5)

gmp_sub — Subtract numbers

resource gmp_sub ( resource $a , resource $b )

Subtracts b from a and returns the result.

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.

A GMP number resource.

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