


Introduction and download of 9 practical PHP libraries compiled_PHP tutorial
1. ReCAPTCHA
The reCAPTCHA library allows you to create advanced CAPTCHA systems for your website, which are actually used to generate verification information, even including voice verification. Of course, there is also the reCAPTCHA service available, which provides an easy-to-use free API and is worth trying on your website.
Download ReCAPTCHA | Get API Key | Documentation
2. Akismet
Akismet is a free service for small sites to modify the specifications of comments that will be added to the database (to prevent malicious comments). This library is being improved all the time.
Please refer to Akismet introduction for details
3. Services_JSON
JSON is an information transfer format that is easy for humans to understand. However, if you are not using a version of PHP later than 5.2.0 (since then PHP has official support for JSON), then you should give this library a try.
View Services_JSON
4. Smarty
Smarty is the official template library of Dingding. It provides many useful functions. In fact, anyone who uses PHP should take a look.
Download Smarty | Official Documentation
5. pChart
pChart is an extremely famous data graphics library. It provides a variety of beautiful charts for data display. In fact, anyone who uses PHP will definitely encounter the situation of using it.
Download pChart | Documentation | View Demo
6. SimplePie
SimplePie lets you easily extract content (like RSS feeds). It can interact with multiple languages and handle feeds in various formats.
Download SimplePie | View documentation | Extend SimplePie for unique RSS Feeds
7. XML-RPC PHP Library
Sometimes you need to use XML-RPC technology to interact with other websites, then try this XML-RPC PHP library.
Download XML-RPC PHP | View documentation
8. Amazon S3
Amazon’s famous cloud computing platform is called “S3”. Here is the Amazon S3 library that allows you to use the cloud and upload large amounts of data files without any additional tools.
Download Amazon S3 PHP Class
9. PHPMailer
Most web applications use PHP’s mail() function. PHPMailer allows you to handle sending emails more flexibly. Not only does it support any format, you can also add attachments and customize headers.
Download PHPMailer | View documentation

To protect the application from session-related XSS attacks, the following measures are required: 1. Set the HttpOnly and Secure flags to protect the session cookies. 2. Export codes for all user inputs. 3. Implement content security policy (CSP) to limit script sources. Through these policies, session-related XSS attacks can be effectively protected and user data can be ensured.

Methods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.

Thesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi

In PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.

The session ID should be regenerated regularly at login, before sensitive operations, and every 30 minutes. 1. Regenerate the session ID when logging in to prevent session fixed attacks. 2. Regenerate before sensitive operations to improve safety. 3. Regular regeneration reduces long-term utilization risks, but the user experience needs to be weighed.

Setting session cookie parameters in PHP can be achieved through the session_set_cookie_params() function. 1) Use this function to set parameters, such as expiration time, path, domain name, security flag, etc.; 2) Call session_start() to make the parameters take effect; 3) Dynamically adjust parameters according to needs, such as user login status; 4) Pay attention to setting secure and httponly flags to improve security.

The main purpose of using sessions in PHP is to maintain the status of the user between different pages. 1) The session is started through the session_start() function, creating a unique session ID and storing it in the user cookie. 2) Session data is saved on the server, allowing data to be passed between different requests, such as login status and shopping cart content.

How to share a session between subdomains? Implemented by setting session cookies for common domain names. 1. Set the domain of the session cookie to .example.com on the server side. 2. Choose the appropriate session storage method, such as memory, database or distributed cache. 3. Pass the session ID through cookies, and the server retrieves and updates the session data based on the ID.


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DVWA
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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),