php中使用static方法

<?php

class Char{
    public static $number = 0;
    public static $name;
    
    function __construct($what){
        self::$name = $what;
    }
    public static function  Join(){
        self::$number++;
        echo self::$number," Is :",self::$name,"<br />";
    }
    
}

$test = new Char('a');
Char::Join();
#注意， 在静态方法中不能访问非静态变量

#Char::Join();
#$test->Join();
#$test::Join();
可以这样调用