略微加速

PHP官方手册 - 互联网笔记

PHP - Manual: gmp_scan1

2024-12-23

gmp_scan1

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

gmp_scan1Scan for 1

说明

gmp_scan1(GMP|int|string $num1, int $start): int

Scans num1, starting with bit start, towards more significant bits, until the first set bit is found.

参数

num1

The number to scan.

GMP 对象或 int ,或数字string

start

The starting bit.

返回值

Returns the index of the found bit, as an int. If no set bit is found, -1 is returned.

范例

示例 #1 gmp_scan1() example

<?php
// "1" bit is found at position 3. index starts at 0
$s1 gmp_init("01000"2);
echo 
gmp_scan1($s10) . "\n";

// "1" bit is found at position 9. index starts at 5
$s2 gmp_init("01000001111"2);
echo 
gmp_scan1($s25) . "\n";
?>

以上例程会输出:

3
9
add a noteadd a note

User Contributed Notes

There are no user contributed notes for this page.

官方地址:https://www.php.net/manual/en/function.gmp-scan1.php

北京半月雨文化科技有限公司.版权所有 京ICP备12026184号-3