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# gmp_setbit

(PHP 4 >= 4.0.4, PHP 5)

gmp_setbit -- Set bit

## Description

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

Sets bit index in a. set_clear defines if the bit is set to 0 or 1. By default the bit is set to 1. Index starts at 0.

> 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.

Example 1. gmp_setbit() example
`<?php $a = gmp_init("0xfd"); gmp_setbit($a, 1); // index starts at 0 echo gmp_strval($a) . "\n"; ?>`
The printout of the above program will be:
    255

See also gmp_clrbit().

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