gmp_testbit
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
gmp_testbit — Tests if a bit is set
Parameters
num-
A GMP object, an int,
or a string that can be interpreted as a number following the same logic
as if the string was used in gmp_init() with automatic
base detection (i.e. when base is equal to 0).
index-
The bit to test
Return Values
Returns true if the bit is set in num,
otherwise false.
Errors/Exceptions
Throws a ValueError if index is negative or, as of PHP 8.5.0, too large.
Prior to PHP 8.0.0, an E_WARNING was raised and false was returned instead.
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:
gmp_sub
GMP Functions