PHP learning summary (1), PHP learning summary
Let’s make a simple summary of the recent PHP learning
Book: "PHP and MySQL Web Development"
Environment/Tools: wamp/Editplus&Chrome
Time: August 2nd - August 7th
Content:
I have learned the first 3 chapters before. The first 3 chapters are mainly about basic syntax and logical control statements, file access and processing, and arrays.
Chapter 4 Strings and Regular Expressions: Various functions for processing characters, the basics and applications of regular expressions.
Chapter 5 Code reuse and function coding: require and include functions, PHP function structure and usage, recursion.
Chapter 6 Object-oriented PHP: Object-oriented concepts and syntax, how to use private and public to control access, and how to implement inheritance.
Chapter 7 Error and Exception Handling: Concepts and control structures of exception handling, Exception class.
These 7 chapters are the basis of PHP (including object-oriented programming syntax), and they will be written below.
Chapter 8 Designing Web Database: In fact, it mainly introduces the concept of relational database (data logical structure is a two-dimensional table).
Chapter 9 Creating a Web Database: In fact, it mainly introduces how to log in to MySQL, how to create a MySQL user and set permissions, how to create database tables and data type settings.
Chapter 10 Using the MySQL database: the use of inert, select, update, alter table, delete, and drop statements (I think this is the key content of MySQL, especially the select statement, but unfortunately I don’t pay attention to it) .
Chapter 11 Using PHP to access the database from the Web: How to use PHP to establish a connection to the MySQL database (interfaces and methods for PHP to interact with the database).
Chapter 12 MySQL Advanced Management: Take a brief look at it, mainly talking about operation permissions and MySQL security. (Can’t quite understand...)
Chapter 13 Advanced MySQL programming: storage engine, transactions, foreign keys and stored procedures. (I can’t quite understand it either...)
Chapter 14 Operating an e-commerce website: Why build a website, risks and threats faced by the website. (Just learn about it)
Chapter 15 E-commerce security issues: main security threats, authentication principles, encryption technology foundation, digital certificates, etc. (Just learn about it)
Chapter 16 Web Application Security (I haven’t finished reading it yet, but after reading this, I think the writing is a bit verbose...)
To summarize: Chapters 1 to 7 are the basics of PHP, Chapters 8 to 11 are the basics of MySQL and PHP accessing databases, Chapters 12 and 13 MySQL advanced management and programming are a bit difficult (you can take a look at it personally), Chapter 14 ~ Chapter Just read Chapter 15 briefly.
Because I have always been interested in programming technology and thought it would be cool to make a website, so I kept learning. I have learned Java and C before, and I have also learned some Servlets and JSP in Web programming, but I have always learned it intermittently and have no practical experience.
In this book, I plan to read the first 18 chapters (the first half) and then stop for a while. The second half of the book is mainly about the advanced technical introduction and application of PHP. First, learn HTML, CSS and JavaScript (I have never paid much attention to it before), then combine the knowledge of the first 18 chapters to make a small website to practice, and then write a summary.
Today, my network is down. I wrote this using EditPlus. I will post it on my blog when the network is repaired.
August 2nd to August 7th at 20:28 pm.
----------------------------------------- -----------------------------------------------Here is the dividing line-- -------------------------------------------------- --------------------------
PS: There was a problem when using basic authentication using the .htaccess file in Chapter 17. I searched on Baidu, but still don’t know how to start.
500Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.


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