Php/docs/function.gmp-clrbit
来自菜鸟教程
gmp_clrbit
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_clrbit — Clear bit
说明
gmp_clrbit
( GMP $a
, int $index
) : void
Clears (sets to 0) bit index in
a. The index starts at 0.
参数
a- PHP 5.5 之前为 GMP 数值资源，PHP 5.6 之后为 GMP 对象或数字，或可以转为数字的字符串。
index- The index of the bit to clear. Index 0 represents the least significant bit.
范例
Example #1 gmp_clrbit() example
<?php$a = gmp_init("0xff");gmp_clrbit($a, 0); // index starts at 0, least significant bitecho gmp_strval($a) . "\n";?>
以上例程会输出：
254
注释
Note:
Unlike most of the other GMP functions, gmp_clrbit() must be called with a GMP resource that already exists (using gmp_init() for example). One will not be automatically created.
