Course Introduction：The instance method depends on object data and the class method operates the class level information. The instance method takes self as the first parameter, and needs to be called through an instance to access and modify the object state; the class method is defined by @classmethod, and cls as the first parameter, and can be called through a class or instance, and is often used for factory methods or class-level operations; if you need to operate the object's own data during selection, you use the instance method, and if you process the logic related to the class, you use the class method.
2025-07-04 comment 0 829
Course Introduction：function is an independent function, suitable for general functions; method is part of the class, suitable for encapsulating object behavior. Function can be called directly, with global scope, cannot access class attributes, does not support object-oriented features, and is suitable for small scripts; method needs to be called through objects or classes, belongs to the class, can access private attributes, supports inheritance polymorphism, and is suitable for large project structures. Function or method should be used according to whether the status and encapsulation are required.
2025-07-23 comment 0 413
Course Introduction：Passing Class Field to Class Method DecoratorWhen attempting to pass a class field to a decorator on a class method, you may encounter an error stating that the field does not exist. This arises because you are attempting to pass the field at the tim
2024-10-18 comment 0 504
Course Introduction：The main differences between @staticmethod and @classmethod are parameter passing, usage scenarios and inheritance performance. 1. In parameter passing, the static method does not automatically pass any implicit parameters, while the class method automatically receives the class object as the first parameter (cls). 2. In terms of usage scenarios, static methods are suitable for tool functions that are independent of classes and instances. Class methods are suitable for factory methods or situations where class state needs to be accessed/modified. 3. In inheritance, the static method is still bound to the class at the time of definition when invoking, and the class method will be automatically bound to the subclass that calls it. When selecting, you should decide which decorator to use based on whether the class or instance is needed and whether it is used to create the instance.
2025-07-07 comment 0 413
Course Introduction：In Python, subclasses can override their behavior by defining methods with the same name as the parent class. At this time, calling this method will be implemented with subclasses first; if the parent class logic is required, super() can be used to call the parent class method; when overwriting, the method signature should be kept consistent, pay attention to self parameters, be careful of multi-layer inheritance chains, and avoid overwriting key methods at will. 1. Subclasses define methods with the same name to overwrite the parent class method; 2. Use super(). Method name() to call the original logic of the parent class; 3. When overwriting, keep the parameters and return values ??consistent to avoid interface errors; 4. Method definition must include self parameters; 5. Multi-layer inheritance must ensure that super is correctly linked; 6. It is not advisable to overwrite the key internal methods of the parent class to avoid causing problems.
2025-07-09 comment 0 1075
Course Advanced 15531
Course Introduction：This course will lead you to cleverly implement image watermark and thumbnail functions through the GD library in PHP. You can easily master the implementation ideas of the case. At the same time, the course also explains how to encapsulate this process into classes, which can further deepen your understanding of object-oriented understanding.
Course Advanced 7163
Course Introduction：This course will lead you to cleverly implement image watermark and thumbnail functions through the GD library in PHP. You can easily master the implementation ideas of the case. At the same time, the course also explains how to encapsulate this process into classes, which can further deepen your understanding of object-oriented understanding.
Course Elementary 21697
Course Introduction："File and Image Technology" mainly introduces the use of PHP to process files and upload images.
Course Elementary 17930
Course Introduction："PHP Fun Class" happily takes everyone to learn PHP, making learning programming less scary. Learning programming is not a scary thing. This class will make learning PHP quite simple and interesting! !
Course Elementary 36820
Course Introduction："PHP Fun Class" makes learning PHP like playing a game, developing, fighting monsters, and breaking through levels, making learning programming no longer a scary thing, but fun and simple! If you find it difficult to learn PHP, then this course is very suitable for you to learn!
How does a PHP static method call a non-static method of the parent class?
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After cross-class call, method cannot be found
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class - How does PHP implement that all subclass attributes have toArray() method?
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Bind custom method parameters to class attributes
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Python - Return a new instance of itself through a class method
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