# gmp_neg

(PHP 4 >= 4.0.4, PHP 5)

gmp_neg — Negate number

### Description

resource gmp_neg ( resource `$a` )

Returns the negative value of a number.

### Parameters

`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.

### Return Values

Returns -`a` , as a GMP number.

### Examples

Example#1 gmp_neg() example

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

The above example will output:

    -1
    1