


Let me introduce to you an example of the construction method of PHP object-oriented programming. Friends in need can refer to it.
Basic syntax for customizing constructors in classes: //php5 [Modifier]function __construct([parameter list]){ } //php4 [Modifier]function class name([parameter list]){ } Learn programming, novices learn PHP object-oriented programming, look at more examples and practice more, and you will make rapid progress. No matter how good the PHP tutorial is, it can't teach you how to write code. You can only practice more on your own! Let’s look at specific examples so that it’s easier to understand. <?php /** php 构造方法 * by 程序员之家 bbs.it-home.org */ class Person{ public $name; public $age; //构造方法 php5 public function __construct($name,$age){ $this->name=$name; $this->age=$age; } //构造方法 php4 写在这里是php5为了兼容PHP4 public function Person($name,$age){ $this->name=$name; $this->age=$age; } } $p1=new Person("老大",27); echo $p1->name; $p1=new Person("小二",26); $p1=new Person("小三",24); ?> Note: 1), understanding of $this: 1. The essence of $this can be understood to be the address of this object. 2. Which object uses $this is the address of that object. 3. $this cannot be used outside the class 2) Understanding of construction methods: The constructor method name is the same as the class name (php4 version). The constructor method name of php5 version can be the same as the class name, or it can be __construct(). The default access modifier of the constructor is public, and the constructor has no return value. After successfully creating a new object, the system automatically calls the constructor of the class. A class has one and only one constructor. After PHP5, although __construct() and classname() can coexist, only one can actually be used. If there is no custom constructor for the class, the class uses the system default constructor. If a constructor is customized for a class, the default constructor of the class is overridden. With the above learning, PHP object-oriented constructor is no longer difficult. |

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.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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