Detailed explanation of similar method calls in PHP

With the development of Internet technology, PHP is a widely used programming language, and more and more people are beginning to come into contact with it. In PHP, calling similar methods is a common technique. This article will introduce similar method calling in PHP.

1. Basic concepts of similar method calls

Similar method calls refer to calling other methods of the class in a class. The characteristic of similar method calls is that you can directly use the properties and methods of the current object without instantiating another object.

2. Syntax for calling similar methods

The syntax for calling similar methods is very simple. You only need to add the self keyword before the method.

Here is an example:

class MyClass {

  protected $foo = 'bar';

  public function myMethod() {
    echo self::internalMethod();
  }

  protected function internalMethod() {
    return $this->foo;
  }
}

$obj = new MyClass();
$obj->myMethod(); // 输出“bar”

In the above example, we have defined a class called MyClass. There is a protected property foo and two methods in this class, one is myMethod method and the other is internalMethod method.

In the myMethod method, we use self::internalMethod() to call similar methods. The self here represents the current class, which is the MyClass class. The internalMethod method is another method of this class. The result of the call will output the value "bar" of the $foo attribute.

3. Precautions for calling similar methods

• The protected and private methods in the parent class cannot be called for the same type.
• Similar method calls will always only call methods in the current class, but not methods in its subclasses.
• Similar method calls can be used in static methods, but in this case the static keyword needs to be used instead of the self keyword.

4. Example explanation

class A {
    protected $name = 'Tom';
    public function getName(){
        return $this->name;    
    }
}

class B extends A {
    public function test(){
        echo $this->getName();    
    }
}

$obj = new B;
$obj->test(); //输出Tom

In the above example, we defined two classes, A and B, where class B is a subclass of class A. In class B we define a test() method, in which the getName() method is called.

In the getName() method, we use $this->name to return the value of the $name attribute of the current object. In the test() method, we directly use $this->getName() to make similar method calls.

The running result will output the value "Tom" of the $name attribute.

5. Summary

Calling similar methods is a very practical technique in PHP, which allows us to operate methods and attributes in classes more conveniently. When calling methods of the same type, you need to pay attention to maintaining the context of the current class and paying attention to the inheritance relationship.

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