(PHP 4 >= 4.0.4, PHP 5)
Returns -a.
例子 1. 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
