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Course Introduction：To create a C class, you need to use the class keyword to define the class name and member; 1. Use the class keyword followed by the class name and surrounded by curly braces; 2. Declare private data members and public member functions in the class; 3. Initialize the object with a constructor; 4. Provide an external access interface through the public access character; 5. Create an object and call its member functions to complete the operation; the complete class definition ends with a semicolon, and should follow the encapsulation principle, set the data members to private, and access it through the public method, so as to realize data hiding and modular design.

2025-08-15 comment 0  582

Course Introduction：Foreach only accesses public attributes when traversing objects in PHP; 2. Protected and private attributes are not visible, even if you use foreach($thisas...) inside the class; 3. To customize the traversal behavior, you can implement the Iterator or IteratorAggregate interface; 4. To check the properties that include private and protected, you need to use the Reflection class; 5.get_object_vars() also only returns the public attributes under the current scope. Therefore, foreach's behavior is the embodiment of PHP encapsulation characteristics, and non-public attributes will not be traversed.

2025-08-04 comment 0  326

Course Introduction：Key Points PHP's array interface allows programmers to simulate the characteristics of native data types in custom classes, similar to Python's methods. This enables custom classes to work like arrays and allows common array operations such as counting elements, looping through elements, and accessing elements through indexes. An interface is like a contract for a class, specifying the methods that a class must contain. They allow encapsulation of implementation details and provide syntax sugar, thereby improving the readability and maintainability of the code. PHP provides a library of predefined interfaces that can implement these interfaces to make objects similar to arrays. Countable, ArrayAccess and Iterator interfaces in PHP allow objects to pass cou respectively

2025-02-22 comment 0  533

Course Introduction：In PHP, custom session processing mechanism requires implementing the SessionHandlerInterface interface and registering handler. 1. Implement six core methods: open(), close(), read(), write(), destroy() and gc() to complete the session storage logic; 2. Create a custom handler class instance and register it through session_set_save_handler(); 3. Call session_start() before use to start the session. Suitable for improving performance, centralized management and extension functions. It is recommended to pay attention to permission control, concurrency problems and security protection to ensure the correct operation of GC and ensure the sess

2025-07-14 comment 0  976

Course Introduction：SqlParameter Parameters.Add vs. AddWithValue: Choosing the Best MethodWhen working with SQL commands, you may encounter the need to add...

2025-01-10 comment 0  736

Course Elementary  13927

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82482

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13265

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24731

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27566

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.