gmp_clrbit()

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

Clear bit

说明

gmp_clrbit(GMP$a,int $index): void

Clears(sets to 0)bit$indexin$a. The index starts at 0.

参数

$a

可以是一个 GMP数据resouce，或一个可以转换为数值的字符串。

$index

The index of the bit to clear. Index 0 represents the least significant bit.

返回值

GMP 数值资源.

范例

gmp_clrbit() example

<?php
$a = gmp_init("0xff");
gmp_clrbit($a, 0); // index starts at 0, least significant bit
echo gmp_strval($a) . "\n";
?>

以上例程会输出：

254

注释

Note:

Unlike most of the other GMP functions,gmp_clrbit() must be called with a GMP resource that already exists(using gmp_init() for example). One will not be automatically created.

参见

• gmp_setbit()Set bit
• gmp_testbit()Tests if a bit is set