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In PHP, an abstract method is a method that cannot be implemented in an abstract class but must be implemented in its implementation class.
Abstract methods can be defined in abstract classes or interfaces, and are defined similarly to ordinary methods, but start with the abstract keyword and omit the method body implementation. Abstract methods must be overridden in subclasses.
If you want to learn how to call abstract methods, this article will provide you with some basic information and tips.
Before learning how to call abstract methods, we need to first understand the concepts of abstract classes and abstract methods.
An abstract class is a class that cannot be instantiated directly. It can only be used as a base class for other classes. Abstract classes can contain abstract methods and non-abstract methods. An abstract method is a method that cannot be implemented in an abstract class but must be implemented in its subclasses.
In PHP, we can use the abstract keyword to define abstract classes and abstract methods.
The following are examples of abstract classes and abstract methods:
abstract class Animal {
abstract public function eat();
}
class Dog extends Animal {
public function eat() {
echo '狗吃狗粮';
}
}
$dog = new Dog();
$dog->eat(); // 输出：“狗吃狗粮”
In the above code, Animal is an abstract class that contains an abstract method eat (), and Dog is a subclass of Animal and must implement the eat() method.
In PHP, we cannot call abstract methods directly because they are not implemented. An abstract method can only be called by instantiating the implementation class after it has been implemented in its implementation class.
The following is an example of calling a class that implements an abstract method:
abstract class Animal {
abstract public function eat();
}
class Dog extends Animal {
public function eat() {
echo '狗吃狗粮';
}
}
$dog = new Dog();
$dog->eat(); // 输出：“狗吃狗粮”
In the above code, we instantiate a Dog object and call eat() method outputs the corresponding results.
An abstract method is a method that cannot be called directly but must be implemented in the implementation class. We can call abstract methods by instantiating a subclass object that implements the abstract method. When using abstract classes and abstract methods, make sure you understand their basic concepts and syntax rules so that you can better use these features to build more flexible and scalable PHP applications.
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