您的位置:寻梦网首页编程乐园PHP 编程PHP5中文手册
PHP5中文手册

gmp_scan0

(PHP 4 >= 4.0.4, PHP 5)

gmp_scan0 — Scan for 0

说明

int gmp_scan0 ( resource $a , int $start )

Scans a , starting with bit start , towards more significant bits, until the first clear bit is found.

参数

a

The number to scan.

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

start

The starting bit.

返回值

Returns the index of the found bit, as an integer. The index starts from 0.

范例

Example#1 gmp_scan0() example

<?php
// "0" bit is found at position 3. index starts at 0
$s1 gmp_init("10111"2);
echo 
gmp_scan0($s10) . "\n";

// "0" bit is found at position 7. index starts at 5
$s2 gmp_init("101110000"2);
echo 
gmp_scan0($s25) . "\n";
?>

上例将输出:

3
7