What is the difference between static abstract methods in php

There are several key differences between static abstract methods and ordinary abstract methods in PHP: 1. Static nature, static abstract methods belong to classes, not objects; 2. Inheritance and implementation, static abstract methods can Inherited and implemented by subclasses; 3. Access permissions. Static abstract methods can have three access modifiers: "public", "protected" or "private".

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

In PHP, there are several key differences between static abstract methods and ordinary abstract methods:

1. Static nature: Static abstract methods belong to classes, not objects. of. This means that you can call static abstract methods directly from the class without creating an instance of the class. Ordinary abstract methods need to be called through an instantiated object of the class.

2. Inheritance and implementation: Static abstract methods can be inherited and implemented by subclasses, just like ordinary abstract methods. Subclasses must implement all static abstract methods in the parent class, otherwise errors will result. The difference is that when a subclass implements a static abstract method, it should be marked with the static keyword.

3. Access permissions: Static abstract methods can have three access modifiers: public, protected, or private, which are the same as ordinary abstract methods.

It should be noted that static abstract methods can only be defined in abstract classes and cannot be defined in ordinary classes. The abstract class itself must be identified using the abstract keyword and cannot be instantiated. An abstract class can contain both ordinary abstract methods and static abstract methods.

The following is a sample code that demonstrates the definition and use of static abstract methods:

abstract class AbstractClass {
    // 定义一个静态抽象方法
    abstract public static function staticAbstractMethod();
    // 定义一个普通抽象方法
    abstract public function abstractMethod();
}
class ConcreteClass extends AbstractClass {
    // 实现父类的静态抽象方法
    public static function staticAbstractMethod() {
        echo 'Implemented static abstract method.' . PHP_EOL;
    }
    // 实现父类的普通抽象方法
    public function abstractMethod() {
        echo 'Implemented abstract method.' . PHP_EOL;
    }
}
// 调用静态抽象方法
ConcreteClass::staticAbstractMethod(); // 输出：Implemented static abstract method.
// 创建类的实例，并调用普通抽象方法
$obj = new ConcreteClass();
$obj->abstractMethod(); // 输出：Implemented abstract method.

To summarize, static abstract methods belong to classes and can be called directly from the class, requiring subclasses to implement them. And need to use static keyword for identification. Ordinary abstract methods belong to objects and need to be called through the instantiated object of the class, and subclasses also need to implement them.

The above is the detailed content of What is the difference between static abstract methods in php. For more information, please follow other related articles on the PHP Chinese website!