gmp_neg

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

Returns -a.

例 683. gmp_neg() example

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

The printout of the above program will be:

-1
1