PHP：一个类中的$this变量如何成为另一个类的对象？

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发生？

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

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).

但这并不一定很有意义,如果启用了E_STRICT,它将调用警告.