(PHP 5 >= 5.3.0, PHP 7, PHP 8)
gmp_testbit — Tests if a bit is set
Returns true if the bit is set in num,
otherwise false.
An E_WARNING level error is issued when
index is less than zero, and false
is returned.
示例 #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));
?>
以上例程会输出：
bool(false) bool(true)