(PHP 5, PHP 7 >= 5.3.0)
Tests if a bit is set
bool gmp_testbit ( GMP $a, int $index )
Tests if the specified bit is set.
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 bit to test
Returns:
Returns TRUE if the bit is set in resource $a, otherwise FALSE.
Exception:
An E_WARNING level error is issued when index is less than zero, and FALSE is returned.
Examples:
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:
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