Call function in function from another class PHP

问题

I have read a few threads about abstract class here at Stackoverflow and I think it's what I need, but I can't get the declaration straight.

What I want to do is to call a function2 (in classB) in a function1 (in classA).

How should I do this?

回答1:

If you only need to access ClassB's method from ClassA but don't need a parent-child relationship between the two, a static method may be more appropriate:

class ClassA
{
  public function method1() {
    echo ClassB::method2();
  }
}

class ClassB
{
  public static function method2() {
    return 'WOOT!';
  }
}

$cls_a = new ClassA();
$cls_a->method1();

// or alternatively, you don't even need to instantiate ClassA
echo ClassB::method2();

来源：https://stackoverflow.com/questions/8420431/call-function-in-function-from-another-class-php