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gmp_setbit

Set bit (PHP 4 >= 4.0.4, PHP 5)
void gmp_setbit ( resource &a, int index [, bool set_clear] )

Sets bit index in a.

Parameters

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.

Return Values

A GMP number resource.

Examples

Example 812. gmp_setbit() example

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

The above example will output:

255


Notes

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.