注册模式

 1 <?php
 2 
 3 class Registry
 4 {
 5     private static $arr;
 6 
 7     public static function get($name)
 8     {
 9         return self::$arr[$name];
10     }
11 
12     public static function set($name, $value)
13     {
14         self::$arr[$name] = $value;
15     }
16 
17     // typically there would be methods to check if a key has already been registered and so on ...
18 }