(PHP 4 >= 4.0.4, PHP 5)
gmp_clrbit — Clear bit
Clears (sets to 0) bit index in a . The index starts at 0.
It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
A GMP number resource.
Example #1 gmp_clrbit() example
<?php
$a = gmp_init("0xff");
gmp_clrbit($a, 0); // index starts at 0, least significant bit
echo gmp_strval($a) . "\n";
?>
上例将输出：
254
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.