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# gmp_clrbit

(PHP 4 >= 4.0.4, PHP 5)

gmp_clrbit -- Clear bit

## Description

void gmp_clrbit ( resource &a, int index )

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

> 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.

Example 1. gmp_clrbit() example
`<?php $a = gmp_init("0xff"); gmp_clrbit($a, 0); // index starts at 0, least significant bit echo gmp_strval($a) . "\n"; ?>`
The printout of the above program will be:
    254

See also gmp_setbit().

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