= 5.3.0, PHP 7, PHP 8)gmp_testbit — Tests if a bit is set說(shuō)明gmp_testbit(GMP|int|string $num, int $index): boolTests if the specified">

gmp_testbit

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

gmp_testbit — Tests if a bit is set

說(shuō)明

gmp_testbit(GMP|int|string $num, int $index): bool

Tests if the specified bit is set.

參數(shù)

num

GMP 對(duì)象或 int ，或數(shù)字string。

index

The bit to test

返回值

Returns true if the bit is set in num, otherwise false.

錯(cuò)誤／異常

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

范例

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));
?>

以上例程會(huì)輸出：

bool(false)
bool(true)

參見(jiàn)