PHP5中文手册·Set bit -- 追寻梦想＞编程乐园＞PHP 编程

说明

void gmp_setbit ( resource &$a , int $index [, bool $set_clear ] )

Sets bit index in a .

参数

a

The number being set to.

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

index

The set bit.

set_clear

Defines if the bit is set to 0 or 1. By default the bit is set to 1. Index starts at 0.

返回值

A GMP number resource.

范例

Example#1 gmp_setbit() example


<?php
$a = gmp_init("0xfd");
gmp_setbit($a, 1); // index starts at 0
echo gmp_strval($a) . "\n";
?>

上例将输出：

注释

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


	PHP5中文手册 gmp_scan1 gmp_sign GMP PHP Manual gmp_setbit (PHP 4 >= 4.0.4, PHP 5) gmp_setbit — Set bit 说明 void gmp_setbit ( resource `&$a` , int `$index` [, bool `$set_clear` ] ) Sets bit `index` in `a` . 参数 `a` The number being set to. It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number. `index` The set bit. `set_clear` Defines if the bit is set to 0 or 1. By default the bit is set to 1. Index starts at 0. 返回值 A GMP number resource. 范例 Example#1 gmp_setbit() example `<?php $a = gmp_init("0xfd"); gmp_setbit($a, 1); // index starts at 0 echo gmp_strval($a) . "\n"; ?>` 上例将输出： 255 注释 Note: Unlike most of the other GMP functions, gmp_setbit() must be called with a GMP resource that already exists (using gmp_init() for example). One will not be automatically created. 参见 gmp_clrbit() gmp_testbit() gmp_scan1 gmp_sign GMP PHP Manual

gmp_setbit

说明

参数

返回值

范例

注释

参见