gmp_setbit
(PHP 4 >= 4.0.4, PHP 5)
gmp_setbit — Set bit
Description
void gmp_setbit
( resource $a
, int $index
[, bool $set_clear = true
] )
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 #1 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.