Bad Wolf's PHP Learning Tutorial Day 1_PHP Tutorial
To develop an interest in PHP, first understand the advantages of PHP over other programs. In fact, there are many advantages. Here are the main points.
PHP can do anything, such as collecting form data, generating dynamic web pages, or sending/receiving Cookies. But PHP's capabilities are far beyond this.
asp---------
1. Microsoft platform, spend money to buy it.
2. Lots of loopholes. It is not open source, and the specific contents of the usage of many code runtime environments are not disclosed.
3. Poor performance. Server system.
4. Program writing is not structured.
5. Debugging is not easy. Errors are difficult to correct.
6. Component support is complex.
jsp---------
1. High hardware requirements.
2. Java basics are required.
3. Debugging is not easy. Errors are difficult to correct.
4. Claimed to be the fastest in execution. (Accelerated through compilation, PHP can also be used)
5. The business model of large enterprises is more suitable. (Banks, enterprises.)
php---------
1. Cross-platform (microsoft, linux, unix), cross-web server (IIS, apache)
2. Structured (similar to C), easy to debug.
3. Good performance.
4 .Low hardware requirements.
5. Open source code, few vulnerabilities, and low risks.
6. Supports a wide range of databases.
Adabas D InterBase PostgreSQL dBase FrontBase SQLite Empress mSQL Solid
FilePro (read-only) Direct MS-SQL Sybase Hyperwave MySQL Velocis IBM DB2 ODBC Unix dbm
Informix Oracle (OCI7 and OCI8) Ingres Ovrimos
Others: bbs, message boards, magazines, articles, website machines .You can even...write command line programs and graphical user interfaces. The most important thing is that it doesn't cost any money.
Approximate operating environment for php:
Server environment: apache+mysql+php+phpmyadmin There is a software called appserv.exe that integrates these.
Writing tools used: Macromedia Dreamweaver or EmEditor, etc.
Let’s have a general understanding of the basic ways of writing PHP. PHP’s echo() statement shows that there are about 4 ways of writing:
The most common way to obtain system information
Write another test for beginners:
< ;?php
echo "Buy a virtual host and find the bad wolf! www.winshell.cn" //Here is the content to be written in php!
?>
html>
Basically learn these first.... The main content will come later....

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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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),

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 English version
Recommended: Win version, supports code prompts!
