search
Homephp教程php手册探讨PHP函数ip2long转换IP时数值太大产生负数的解决方法

探讨PHP函数ip2long转换IP时数值太大产生负数的解决方法

Jun 13, 2016 am 11:50 AM
phpfunctionreasonDiscussnumerical valuemethodhourofsolvenegative numberConvert

【造成原因】:Because PHP's integer type is signed, and many IP addresses will result in negative integers.
【解决办法】:其官方手册中提到,可以“you need to use the "%u" formatter of sprintf() or printf() to get the string representation of the unsigned IP address”
即,printf( '%u', ip2long( 'IP地址' ) );
或者将其先转换为二进制然后在转换为十进制,bindec( decbin( ip2long( 'IP地址' ) ) );
【测试】
$strIp = '182.118.0.0';

echo ip2long($strIp); //此时输出的-1233780736
echo '
';
echo bindec( decbin( ip2long( $strIp ) ) ); // 输出3061186560,与MySQL函数输出一致~

【注】:
number bindec ( string $binary_string ); //二进制转换为十进制
string decbin ( int $number ); //十进制转换为二进制

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function