gmp_neg

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

gmp_neg — Negate number

function gmp_neg(GMP|int|string $num): GMP

Returns the negative value of a number.

num: A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init() with automatic base detection (i.e. when base is equal to 0).

Returns -num, as a GMP number.

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