PHP:一个类中的 $this 变量如何成为另一个类的对象？

Question

这是一个例子:

class Test {

    public function TestMethod() {

        print_r($this); // Gives me "Test1 Object ( )"

    }
}

class Test1 {

    public function Test1Method() {

        Test::TestMethod();

    }
}

$test1 = new Test1;
$test1->Test1Method();

我觉得这很奇怪。任何人都可以向我解释为什么会这样吗？

Answer 1

来自 http://www.php.net/manual/en/language.oop5.basic.php :

The pseudo-variable $this is available when a method is called from within an object context. $this is a reference to the calling object (usually the object to which the method belongs, but possibly another object, if the method is called statically from the context of a secondary object).

不过，这不一定很有意义，如果启用了 E_STRICT，则会引发警告。