gmp_testbit

(No version information available, might be only in CVS)

gmp_testbit — Tests if a bit is set

bool gmp_testbit ( resource $a , int $index )

Tests if the specified bit is set.

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

如果成功则返回 TRUE，失败则返回 FALSE。

E_WARNING is issued when index is less than zero.

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)


	PHP5中文手册 gmp_sub gmp_xor GMP PHP Manual 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) 参见 gmp_setbit() gmp_clrbit() gmp_sub gmp_xor GMP PHP Manual