A brief discussion on core architecture design

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

5. range object of API

#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.

8. Output string in PHP (echo, print, printf, print_r, var_dump) java printf printf d printf source code

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:

10. powerpoint2003 official download for free Summary of the usage differences between print EOT delimiter and echo EOT in the full version of PHP

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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