gmp_testbit

(PHP 5 >= 5.3.0, PHP 7)

gmp_testbit — Tests if a bit is set

说明

gmp_testbit ( GMP $a , int $index ) : bool

Tests if the specified bit is set.

参数

a

可以是一个 GMP 数据 resouce，或一个可以转换为数值的字符串。

index

The bit to test

返回值

Returns TRUE if the bit is set in resource $a, otherwise FALSE.

错误／异常

An E_WARNING level error is issued when index is less than zero, and FALSE is returned.

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));
?>

以上例程会输出：

bool(false)
bool(true)

参见

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