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PHP5中文手册

gmp_neg

(PHP 4 >= 4.0.4, PHP 5)

gmp_neg — Negate number

说明

resource gmp_neg ( resource $a )

Returns the negative value of a number.

参数

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

Returns -a , as a GMP number.

范例

Example#1 gmp_neg() example

<?php
$neg1 
gmp_neg("1");
echo 
gmp_strval($neg1) . "\n";
$neg2 gmp_neg("-1");
echo 
gmp_strval($neg2) . "\n";
?>

上例将输出:

-1
1