GMP Functions
PHP Manual

gmp_clrbit

(PHP 4 >= 4.0.4, PHP 5)

gmp_clrbit — Clear bit

Description

void gmp_clrbit ( GMP $a , int $index )

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

Parameters

a

Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.

index

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

Return Values

A GMP number resource in PHP 5.5 and earlier, or a GMP object in PHP 5.6 and later.

Examples

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 above example will output:

254

Notes

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.

See Also

GMP Functions
PHP Manual