本文实例讲述了php自定文件保存session的方法。分享给大家供大家参考。具体实现方法如下:
session.inc.php文件:定义session的文件存储,session解决方案,就是要提供在php脚本中定义全局变量的方法,使得这个全局变量在同一个session中对于所有的php脚本都有效,我们都知道,session不是一个简单的时间概念,一个session中还包括了特定的用户和服务器,因此更详细地讲,在一个session定义的全局变量的作用范围,是指这个session所对应的用户所访问的所有php,例如a用户通过session定义了一个全局变量$user="wind"中,而b用户通过session定义的全局变量$user="jane",那么在a用户所访问的php脚本中,$user的值就是wind.
php如何创建session
开始介绍如何创建 session,非常简单,启动 session 会话,并创建一个 $admin 变量:
启动 session:
session_start();
声明一个名为 admin 的变量,并赋空值:$_session["admin"] = null;
如果你使用了 seesion,或者该 php 文件要调用 session 变量,那么就必须在调用 session 之前启动它,使用 session_start() 函数,其它都不需要你设置了,php 自动完成 session 文件的创建,执行完这个程序后,我们可以到系统临时文件夹找到这个 session 文件,一般文件名形如:sess_4c83638b3b0dbf65583181c2f89168ec,后面是 32 位编码后的随机字符串,用编辑器打开它,看一下它的内容:admin|n;,PHP实例代码如下:
代码如下:
//定义一个超全局数组
$_session = array();
//定义文件句柄
$fp = null;
//用户自定义的开启session函数
function session_file_start() {
//1. 首先判断浏览器有没有发送cookie值
if (isset($_cookie['fileid'])) {
//2. 接收cookie值
$filename = $_cookie['fileid'];
//3. 打开文件,用于读写
if (file_exists($filename)) {
$globals['fp'] = fopen($filename, 'r+');
} else {
$globals['fp'] = fopen($filename, 'w+');
}
} else {
//2. 设置一个文件,并把该文件名放到cookie中
$filename = date('ymdhis');
setcookie('fileid', $filename, time()+60*60*24);
//3. 打开文件,用于读写
$globals['fp'] = fopen($filename, 'w+');
} //end of if-else
//4. 把文件中的数据存储到超全局数组$_session中
while (!feof($globals['fp'])) {
//读取文件中的一行
$buffer = fgets($globals['fp']);
//处理所读取的这一行
$tmparr = explode('=', trim($buffer, 'rn'));
//添加到session数组中
if (count($tmparr) == 2) {
$globals['_session'][$tmparr[0]] = $tmparr[1];
}
} //end of while
} //end of session_file_start()
//注册会话变量的函数
function session_file_register($key, $val) {
//设定session变量
$globals['_session'][$key] = $val;
//把该变量放到文件中
fseek($globals['fp'], 0, seek_end);
fwrite($globals['fp'], "$key=$valrn");
} //end of session_file_register()
//结束会话变量
function session_file_destroy() {
//1. 关闭文件指针
fclose($globals['fp']);
$fp = null;
//2. 设置session数组为空
$globals['_session'] = array();
} //end of session_file_destroy()
测试代码文件:1.php
代码如下:
//确定编码格式
header('content-type: text/html; charset=utf-8');
include("session-file.php");
//测试函数:
//开启会话
session_file_start();
//注册会话变量
$key = 'username';
$val = 'lsl';
session_file_register($key, $val);
session_file_register('username', 'lisa');
//打印session数组
echo $_session['username'];
?>
下一页
测试文件:2.php
代码如下:
//确定编码格式
header('content-type: text/html; charset=utf-8');
include("session-file.php");
//测试函数:
//开启会话
session_file_start();
echo $_session['username'];
?>
希望本文所述对大家的PHP程序设计有所帮助。

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

SublimeText3 English version
Recommended: Win version, supports code prompts!

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),

SublimeText3 Mac version
God-level code editing software (SublimeText3)

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

Atom editor mac version download
The most popular open source editor