php如何在类函数中需要一个类？ [关闭]

Question

I have a class:

class Test {

 public function someFunction()
 {

    require('SomeOtherClass.php');

 }


}

I can't understand how php requires the class here if another class physically can't be inside a function of a class? how php does this? where php puts the class then?

Answer 1

This is perfectly valid code:

function foo() {
    class Foobar {
        function speak() {
            echo "Hi";
        }
    }
    $obj = new Foobar();
    $obj->speak();
}
// $obj = new Foobar(); // Will fail, as Foobar will be defined the global scope when running foo();
foo();
$obj = new Foobar(); // Will be OK, now the class is defined in the global scope
//foo(); // Fatal error: Cannot redeclare class Foobar 

The output is:

Hi

For details see documentation.