PHP5中文手册·Negate number -- 追寻梦想＞编程乐园＞PHP 编程

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.

Example#1 gmp_neg() example


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

上例将输出：

-1
1


	PHP5中文手册 gmp_mul gmp_nextprime GMP PHP Manual gmp_neg (PHP 4 >= 4.0.4, PHP 5) gmp_neg — Negate number 说明 resource gmp_neg ( resource `$a` ) Returns the negative value of a number. 参数 `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. 返回值 Returns -`a` , as a GMP number. 范例 Example#1 gmp_neg() example `<?php $neg1 = gmp_neg("1"); echo gmp_strval($neg1) . "\n"; $neg2 = gmp_neg("-1"); echo gmp_strval($neg2) . "\n"; ?>` 上例将输出： -1 1 gmp_mul gmp_nextprime GMP PHP Manual