php中类的static变量使用

 <?php
 #访问静态变量
 #类外部: 类名::$类变量名
 #类内部: 娄名::$类变量名或self::$类变量名
 class Char{
     public static $number = 0;
     public $name;

     function __construct($what){
         $this->name = $what;
     }
     function Join(){
         self::$number++;
         echo self::$number," Is :",$this->name,"<br />";
     }

 }

 $test = range('a','z');
 foreach($test as $values){
     $what = new Char($values);
     $what->Join();
 }