php:什么时候需要使用self::method()？

php: when need to use self::method()?

本问题已经有最佳答案，请猛点这里访问。

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<?php

class MyClass
{
public $prop1 ="I'm a class property!";

public function __construct()
{
echo 'The class"', __CLASS__, '" was initiated!<br />';
}

public function __destruct()
{
echo 'The class"', __CLASS__, '" was destroyed.<br />';
}

public function __toString()
{
echo"Using the toString method:";
return $this->getProperty();
}

public function setProperty($newval)
{
$this->prop1 = $newval;
}

public function getProperty()
{
return $this->prop1 ."<br />";
}
}

class MyOtherClass extends MyClass
{
public function __construct()
{
parent::__construct(); // Call the parent class's constructor
$this->newSubClass();
}

public function newSubClass()
{
echo"From a new subClass" . __CLASS__ .".<br />";
}
}

// Create a new object
$newobj = new MyOtherClass;

?>

问题：

如果把$this->newSubClass();改成self::newSubClass();也可以，那么当我需要使用$this->newSubClass();时，什么时候需要使用self::newSubClass();时？