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GMP Функции
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# gmp_setbit

(PHP 4 >= 4.0.4, PHP 5)

gmp_setbit — Set bit

### Описание

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

Sets bit `index` in `a` .

### Список параметров

`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.

### Возвращаемые значения

A GMP number resource.

### Примеры

Пример #1 gmp_setbit() example

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

Результат выполнения данного примера:

    255

### Примечания

> Замечание: 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.

### Смотрите также

- gmp_clrbit() - Clear bit
- gmp_testbit() - Tests if a bit is set

gmp_scan1
gmp_sign
GMP Функции
PHP Manual