释放当前在内存中已经创建的所有$_SESSION变量,但不删除session文件以及不释放对应的sessionid
session_destroy()
删除当前用户对应的session文件以及释放sessionid,内存中的$_SESSION变量内容依然保留
因此,释放用户的session所有资源,需要顺序执行如下代码:
程序代码
复制代码 代码如下:
$_SESSION['user'] = 'wangh';
session_unset();
session_destroy();
?>
如果只是调用session_destroy();
那么echo $_SESSION['user']依然是有值的
即内存中的$_SESSION变量内容依然保留
[Session]
session.save_handler = files ; 用于保存/取回数据的控制方式
session.save_path = C:\win\temp ; 在 save_handler 设为文件时传给控制器的参数,
; 这是数据文件将保存的路径。文件夹要事先建好
session.use_cookies = 1 ; 是否使用cookies 1是,0否
session.name = PHPSESSID
; 用在cookie里的session的名字
session.auto_start = 0 ; 在请求启动时初始化session
session.cookie_lifetime = 0 ; 为按秒记的cookie的保存时间,
; 或为0时,直到浏览器被重启
session.cookie_path = / ; cookie的有效路径
session.cookie_domain = ; cookie的有效域
session.serialize_handler = php ; 用于连接数据的控制器
; php是 PHP 的标准控制器。
session.gc_probability = 1 ; 按百分比的'garbage collection(碎片整理)'进程
; 在每次 session 初始化的时候开始的可能性。
session.gc_maxlifetime = 1440 ; 在这里数字所指的秒数后,保存的数据将被视为
; '碎片(garbage)'并由gc 进程清理掉。
session.referer_check = ; 检查 HTTP引用以使额外包含于URLs中的ids无效
session.entropy_length = 0 ; 从文件中读取多少字节
session.entropy_file = ; 指定这里建立 session id
; session.entropy_length = 16
; session.entropy_file = /dev/urandom
session.cache_limiter = nocache ; 设为{nocache,private,public},以决定 HTTP 的
; 缓存问题
session.cache_expire = 180 ; 文档在 n 分钟后过时
session.use_trans_sid = 1 ; 使用过渡性的 sid 支持,若编译时许可了
; --enable-trans-sid
url_rewriter.tags = "a=href,area=href,frame=src,input=src,form=fakeentry"

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.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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