PHP documentation update_PHP tutorial
php.net最近更新了php文档,比较有用的是新增的pman工具。pman是一个命令行小工具,方便查看php函数的本地帮助文档,但是不包含php.net的评论数据。简单的试用心得如下:
安装pman
使用传说中的pear来安装pman
sudo pear install doc.php.net/pman
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如果pear版本比较老,需要先升级pear才可以继续
sudo pear upgrade pear
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pman使用方法
pman的使用方法很傻瓜,比如我们想查看strlen的帮助信息:
pman strlen
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帮助文本的内容是彩色的,能和chm版本的php帮助文档媲美。pman的详细使用帮助如下
#pman --help man, version 1.6c usage: man [-adfhktwW] [section] [-M path] [-P pager] [-S list] [-m system] [-p string] name ... a : find all matching entries c : do not use cat file d : print gobs of debugging information D : as for -d, but also display the pages f : same as whatis(1) h : print this help message k : same as apropos(1) K : search for a string in all pages t : use troff to format pages for printing w : print location of man page(s) that would be displayed (if no name given: print directories that would be searched) W : as for -w, but display filenames only C file : use `file as configuration file M path : set search path for manual pages to `path P pager : use program `pager to display pages S list : colon separated section list m system : search for alternate systems man pages p string : string tells which preprocessors to run e - [n]eqn(1) p - pic(1) t - tbl(1) g - grap(1) r - refer(1) v - vgrind(1)
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还有一个好处是在vim里查看php帮助信息更方便了,结合完美
:!pman strlen
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Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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