How to call methods in other classes in php class

The methods for calling other classes in the php class are: 1. Create a PHP sample file; 2. Create two classes, A and B; 3. In classA, use "$b = new B( )" instantiates B and creates a "$b" object; 3. Call the "someMethod()" method in class B through "$b->someMethod()".

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

To call methods of other classes in a PHP class, you need to instantiate the class first, and then call the corresponding method through the instance object.

For example, suppose there are two classes A and B, and you want to call the method of class B in class A, you can use the following method:

```
<?php
class A {
  function someFunction() {
    $b = new B();
    $result = $b->someMethod();
    return $result;
  }
}
class B {
  function someMethod() {
    // 做一些操作
  }
}
?>
```

Where, `$b = new B()` instantiates class B and creates a `$b` object, then you can call the `someMethod()` method in class B through `$b->someMethod()`.

Calling methods in other classes can improve code reusability and maintainability. When multiple classes share certain functions or logic, these common functions can be abstracted into independent classes and methods and called when needed. This can reduce code duplication, improve code readability and maintainability, and facilitate code expansion and refactoring.

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