gmp_testbit
(No version information available, might be only in CVS)
gmp_testbit — Tests if a bit is set
说明
bool gmp_testbit
( resource $a
, int $index
)
Tests if the specified bit is set.
参数
- 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
返回值
如果成功则返回 TRUE，失败则返回 FALSE。
错误／异常
E_WARNING is issued when index is less than zero.
范例
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));
?>
上例将输出：
bool(false) bool(true)
