search
HomeBackend DevelopmentPHP Tutorial不同访客显示不同内容,同一访客以后访问内容不变,清除缓存除外

不同访客展示不同内容,同一访客以后访问内容不变,清除缓存除外。
例如
1、有5个内容A、B、C、D、E,其中一个将要网页的一个或多个位置展示。
2、第一个访问者访问该网页后,看到A内容,以后该访问者再打开这个网页时,看到的都是内容A,除非他清除浏览器缓存。
3、第二个访问者访问该网页后,看到B内容,以后该访问者再打开这个网页时,看到的都是内容B,除非他清除浏览器缓存。
4、。。。
5、第六个访问者访问该网页后,看到A内容,以后该访问者再打开这个网页时,看到的都是内容A,除非他清除浏览器缓存。
6、第七个访问者访问该网页后,看到B内容,以后该访问者再打开这个网页时,看到的都是内容B,除非他清除浏览器缓存。
如些循环

相当于每进一个访客就从5个内容中按顺序取一个显示给访客,取完5个后再循环。

这个功能的代码怎么写呢?
------解决思路----------------------

本帖最后由 fdipzone 于 2015-04-06 17:24:06 编辑
<br />$arr = array('A','B','C','D','E');<br />$file = 'data.log';<br /><br />// 获取未显示过的page,如全部已显示,则重新赋值<br />if(file_exists($file)){<br />    $data = json_decode(file_get_contents($file),true);<br />    if(!$data){<br />        $data = $arr;<br />    }<br />}else{<br />    $data = $arr;<br />}<br /><br />// 判断用户是否访问过,如访问过直接显示上次访问的结果,否则抽取最前一页,写入用户cookies<br />if(isset($_COOKIE['show'])){<br />    $result = $_COOKIE['show'];<br />}else{<br />    $result = array_splice($data,0,1);<br />    $result = array_pop($result);<br />    setcookie('show',$result,time()+3600);<br />    file_put_contents($file, json_encode($data), true);<br />}<br /><br />echo $result;<br />

------解决思路----------------------
<br /><?php<br />$content = array('A', 'B', 'C', 'D', 'E');<br />!($cookie = intval($_COOKIE['content'])) && setcookie('content', $cookie = rand(0, count($content) - 1));<br />echo $content[$cookie];<br />
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
What is PDO in PHP?What is PDO in PHP?Apr 28, 2025 pm 04:51 PM

The article discusses PHP Data Objects (PDO), an extension for database access in PHP. It highlights PDO's role in enhancing security through prepared statements and its benefits over MySQLi, including database abstraction and better error handling.

What is Memcache and Memcached in PHP? Is it possible to share a single instance of a Memcache between several projects of PHP?What is Memcache and Memcached in PHP? Is it possible to share a single instance of a Memcache between several projects of PHP?Apr 28, 2025 pm 04:47 PM

Memcache and Memcached are PHP caching systems that speed up web apps by reducing database load. A single instance can be shared among projects with careful key management.

What are the steps to create a new database using MySQL and PHP?What are the steps to create a new database using MySQL and PHP?Apr 28, 2025 pm 04:44 PM

Article discusses steps to create and manage MySQL databases using PHP, focusing on connection, creation, common errors, and security measures.

Does JavaScript interact with PHP?Does JavaScript interact with PHP?Apr 28, 2025 pm 04:43 PM

The article discusses how JavaScript and PHP interact indirectly through HTTP requests due to their different environments. It covers methods for sending data from JavaScript to PHP and highlights security considerations like data validation and prot

How to execute a PHP script from the command line?How to execute a PHP script from the command line?Apr 28, 2025 pm 04:41 PM

The article discusses executing PHP scripts from the command line, including steps, common options, troubleshooting errors, and security considerations.

What is PEAR in PHP?What is PEAR in PHP?Apr 28, 2025 pm 04:38 PM

PEAR is a PHP framework for reusable components, enhancing development with package management, coding standards, and community support.

What are the uses of PHP?What are the uses of PHP?Apr 28, 2025 pm 04:37 PM

PHP is a versatile scripting language used mainly for web development, creating dynamic pages, and can also be utilized for command-line scripting, desktop apps, and API development.

What was the old name of PHP?What was the old name of PHP?Apr 28, 2025 pm 04:36 PM

The article discusses PHP's evolution from "Personal Home Page Tools" in 1995 to "PHP: Hypertext Preprocessor" in 1998, reflecting its expanded use beyond personal websites.

See all articles

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 Tools

EditPlus Chinese cracked version

EditPlus Chinese cracked version

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

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),