How to call a method of another class in PHP?

In object-oriented programming, dependencies between classes are very common. When one class needs to use the method of another class, we need to use calls between classes.

There are several ways in PHP for a class to call a method of another class:

1. Create an object to call a method

We can call a method in a class Create an object in a method and then call a method of another class.

The sample code is as follows:

class A{
    public function test(){
        $b=new B();
        $b->output();
   }
}
class B{
   public function output(){
       echo "hello world";
   }
}

$a=new A();
$a->test();

2. Inherit another class

The subclass can inherit the method of the parent class, so that it can directly use the parent class's method method without creating an object of the parent class.

The sample code is as follows:

class A{
    public function output(){
        echo "hello world";
    }
}
class B extends A{
    public function test(){
        $this->output();
    }
}

$b=new B();
$b->test();

3. Using static methods and static properties

Static methods and properties are a special type of class, they do not require Use objects to call. It can be called directly using the class name plus the method name or property name.

The sample code is as follows:

class A{
    public static function output(){
        echo "hello world";
    }
}
class B{
    public static function test(){
        A::output();
    }
}

B::test();

These are three common ways for one class to call the method of another class in PHP. In actual development, we should choose which method to use according to the specific situation.

Summary

The above are the three ways for a class to call the method of another class in PHP, namely creating an object to call the method, inheriting another class and using static methods and static properties. It should be noted that using inheritance and static methods/properties is more concise and convenient than using objects to call methods.

Developers should have good object-oriented programming ideas and practical experience.

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