Let's talk about php object-oriented private methods

PHP is a popular programming language that has many useful features and tools. One very important feature is object-oriented programming, a programming paradigm that makes code more scalable and reusable.

In PHP, an important aspect of object-oriented programming is private methods. A private method is a method that can only be used by the class itself. It can achieve many important functions, such as protecting the data of the class from external access.

Let’s take a look at how to define private methods in PHP.

1. When defining a class, use the keyword private to define private methods, for example:

class MyClass {
    private function myPrivateFunction() {
        // do something here
    }
}

2. Call private methods through the public methods of the class, for example:

class MyClass {
    private function myPrivateFunction() {
        // do something here
    }

    public function myPublicFunction() {
        $this->myPrivateFunction();
    }
}

In the above example, we call the private method myPrivateFunction through the public method myPublicFunction.

3. Access the private properties of the class in the private method, for example:

class MyClass {
    private $myPrivateProperty = "Hello World!";

    private function myPrivateFunction() {
        echo $this->myPrivateProperty;
    }
}

In the above example, we access the private property myPrivateProperty of the class in the private method.

4. Inherit private methods

If we want to inherit a private method from a parent class, we need to use the protected keyword to define a protected method, and then in the child This protected method is accessed through inheritance in the class.

class ParentClass {
    private function myPrivateFunction() {
        // do something here
    }

    protected function myProtectedFunction() {
        $this->myPrivateFunction();
    }
}

class ChildClass extends ParentClass {
    public function myPublicFunction() {
        $this->myProtectedFunction();
    }
}

In the above example, we defined a private method myPrivateFunction and a protected method myProtectedFunction in the parent class. Then, in the subclass, we call the protected method myProtectedFunction through the public method myPublicFunction, thus realizing the function of inheriting the private method.

In short, private methods in PHP are very useful functions, which can help us protect the data of the class while improving the scalability and reusability of the code. The above example is just a brief introduction. In actual application, you can define and use private methods according to your own needs.

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