add zone file

Author: rwifeng

src/Qiniu/Zone.php

@@ -0,0 +1,35 @@
+<?php
+namespace Qiniu;
+
+final Class Zone 
+{
+    const ZONE0 = 0,                          // Zone 常量， 现在有两个zone可以设置，zone0 & zone1
+          ZONE1 = 1;
+
+    public $upHost;
+
+    public function  __construct($upHost) {  
+        $this->upHost = $upHost; 
+    } 
+
+    public static function zone0() {
+        return self::zone(self::ZONE0);
+    }
+
+    public static function zone1() {
+        return self::zone(self::ZONE1);
+    }
+
+    public static function zone($z) {
+        switch ($z) {
+            case self::ZONE0:
+                return new self('http://up.qiniu.com');
+                break;
+            case self::ZONE1:
+                return new self('http://up-z1.qiniu.com');
+                break;
+        }
+        return;
+    }
+}
+