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Tests if a bit is set
GMP Functions
PHP Manual

gmp_testbit

(PHP 5 >= 5.3.0)

gmp_testbit — Tests if a bit is set

Description

bool gmp_testbit ( resource $a , int $index )

Tests if the specified bit is set.

Parameters

a

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 bit to test

Return Values

Returns TRUE on success or FALSE on failure.

Errors/Exceptions

E_WARNING is issued when index is less than zero.

Examples

Example #1 gmp_testbit() example

<?php
$n = gmp_init("1000000");
var_dump(gmp_testbit($n, 1));
gmp_setbit($n, 1);
var_dump(gmp_testbit($n, 1));
?>

The above example will output:

 bool(false) bool(true)

See Also

GMP Functions
PHP Manual