Recently, the discussion atmosphere in the blog park has been lively, and valuable comments have emerged one after another. Sometimes we would like to subscribe to the RSS comments of a certain article, but unfortunately the blog park does not currently have this function. For registered users, we can click the "Subscribe to Reply" link below the comment box to receive emails when new comments appear. It's a pity that anonymous users have to refresh constantly to pay attention to what has been discussed recently. But who are we? We are programmers, and this obstacle should be nothing more than a trivial matter for us. Build your own site, get page data, analyze HTML, and output it as RSS, it's that simple. Lao Zhao gave the simplest example for this. You can subscribe to the comments of any article on http://jeffreyzhao.cnblogs.com. Because it is just a simple personal tool program, it does not consider performance, scalability, scalability, fault tolerance, and discards any "best practices" such as unit testing and dependency injection. In a word, it comes as easy as it comes. This example consists of two parts. The first part is a static HTML page that is generated based on the article URL and redirects to its RSS link. Just a few lines of HTML
1. Code example for manually generating comment RSS
##Introduction: Recently, the discussion atmosphere in the blog park has been lively, and valuable comments have emerged one after another. Sometimes we would like to subscribe to the RSS comments of a certain article, but unfortunately the blog park does not currently have this function. For registered users, we can click the "Subscribe to Reply" link below the comment box to receive emails when new comments appear. It's a pity that anonymous users have to refresh constantly to pay attention to what has been discussed recently.
2. php gets the values of form form radio buttons and check boxes
Introduction: Radio buttons generally appear in groups, with the same name value and different value values. In a group of radio buttons, only one radio button can be selected at the same time. Selected.
3. PHP implements front-end and back-end real-time push based on websocket
Introduction: Register an account on the goeasy official website and create a new app. After the APP is created, the system will automatically generate two keys for the app, one can be used to receive and push (supper key ), the other can only be used to receive (subscriber key).
4. HTML implementation of voting website cheating scheme that restricts IP
#Introduction: Many voting websites cannot vote repeatedly. They mainly restrict IP addresses. An IP address can only vote once. Let’s take a look at it together. Let’s look at the voting website cheating scheme that uses HTML to limit IP addresses. Friends who need it can refer to
#Introduction: Range object: It is a fragment (HTML fragment), which contains a node or part of a text node. Under normal circumstances, only
6 is possible on the page at the same time. Detailed explanation of the let command in ES6
Introduction: let is a new copy command in ES6. The let assignment command can only be called in the {} code block. This article mainly introduces the let command in ES6. Friends who need it can refer to
7. Comprehensive exposure to SQL syntax (5)
Introduction: BETWEEN...AND operator Determines whether a certain person's value is within a specific range. This operator can only be used in SQL statements.
Introduction: printf: Output string in PHP (echo, print, printf, print_r, var_dump): In PHP, there are four methods to output string. The echo structure can output multiple ones at a time; print() can only output one; printf() can format the output; print_r() can output an array, which is very beneficial for debugging. 1. echo echo is a keyword of PHP, it does not return. In terms of writing, it can omit the parentheses. The following code: echo'Test String'; echo('Test String'); 2.print print is also a PHP
9. File upload PHP image file upload implementation code
Introduction: File upload: File upload PHP Image file upload implementation code: For the security of the website, uploading PHP files is definitely not allowed. If someone enters your background and uploads A php file and your website source code are all saved and become his, and he can package them directly to see your code. Therefore, you must control the uploaded directory and file type. Generally, only images can be uploaded. Creating a File Upload Form It is very useful to allow users to upload files from a form. Please look at the following HTML form for uploading files: Copy the code as follows:
Introduction: Powerpoint2003 official download free full version: Powerpoint2003 official download free full version PHP Understand print Summary of the difference between EOT delimiter and echo EOT usage: echo can output multiple strings at the same time in HTML and PHP writing, and parentheses are not needed. Print can only output a string at the same time and requires parentheses. The usage of print is very similar to C language, so % in the output content will be specially interpreted. Echo has no return value, print() has a return value, and returns false when its execution fails (such as disconnection). echo can have multiple parameters, print can have one parameter. It is recommended to use echo.
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The above is the detailed content of A brief discussion on core architecture design. For more information, please follow other related articles on the PHP Chinese website!

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

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.


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