gmp_neg

Negate number (PHP 4 >= 4.0.4, PHP 5)
resource gmp_neg ( resource a )

Returns the negative value of a number.

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.

Returns -a, as a GMP number.

<?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

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