2 Basic related issues

Source: Internet
Author: User
Tags echo b
2 Basic issues
Two questions:

Does the constant inside the class allow direct access to the instance double colon, Zhang Enmin? What's the actual situation?

Class a{
Const MM=10;
function __construct () {
Echo self::mm;
echo $a:: mm;

Static members, invoked through an instance, is this a good way? Why
Class a{
public static $mm = 10;
$a =new A;
echo $a:: $mm;

PHP Code
Class b{  const mm=10;  function __construct () {  echo self::mm;  }} echo b::mm; #10class C {  
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