(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_neg — Negate number
Returns -a, 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";
?>
以上例程会输出：
-1 1