php 类中的常量、静态属性、非静态属性的区别

class Myclass{
 const constant = '常量';

 //类内部调用
 public function test(){
  echo self::constant.'<br>';
 } 
}
Myclass::test();
//类外部访问
echo Myclass::constant.'<br>'; //方法一

$obj = new Myclass();  //方法二
echo $obj::constant.'<br>';

class Myclass{
 public static $static_val = '静态属性';
 //类内部访问
 public function test(){
  return self::$static_val.'<br>';
 } 
}

//类外部访问
// echo Myclass::test();
echo Myclass::$static_val;  //方法一
$obj = new Myclass();    //方法二
echo $obj::$static_val;
echo $obj->test();

class Myclass{
 public $normal_val = '非静态属性';

 //类内部访问
 public function test(){
  return $this->normal_val ;
 } 
}
//类外部访问
$obj = new Myclass(); 
echo $obj->normal_val;
echo $obj->test();

$r = new ReflectionClass($this); 
Zend_Debug::dump($r->getConstants(), "Constants"); 
Zend_Debug::dump($r->getProperties(), "Properties"); 
Zend_Debug::dump($r->getMethods(), "Methods");