PHP命名空间和自动加载初探

 1 <?php
 2 /**
 3  * @Author: Martin
 4  * @Support: Martin
 5  * @Last Modified by:   Martin
 6  */
 7 namespace Order;
 8 
 9 const STR = ‘order list<br />‘;
10 
11 function detail()
12 {
13     return ‘order detail<br />‘;
14 }
15 function call_by_self()
16 {
17     return ‘call by self<br />‘;
18 }
19 /**
20  *
21  */
22 class Orderlist
23 {
24 
25     public function __construct()
26     {
27         echo ‘Class NameSpace is "‘, __NAMESPACE__, ‘"‘;
28     }
29     public function show_list()
30     {
31         for ($i = 0; $i < 5; $i++) {
32             echo "<ul><li>this is order$i<br />";
33             //内部直接访问
34             echo detail();
35             echo "</li></ul>";
36         }
37     }
38 }
39 //内部通过命名空间访问
40 echo \Order\call_by_self();

 1 <?php
 2 /**
 3  * @Author: Martin
 4  * @Support: Martin
 5  * @Last Modified by:   Martin
 6  */
 7 namespace index;
 8 include_once(‘Order.php‘);
 9 
10 //外部访问class 实例化即可使用
11 use Order\Orderlist;
12 $orderlist = new orderlist;
13 $orderlist->show_list();
14 
15 //外部访问静态变量和function 直接访问
16 use Order;
17 echo Order\STR;
18 echo Order\detail();

1 namespace User;
2 //直接载入Order
3 #include(‘Order.php‘);
4 //自动载入
5 spl_autoload_register(function($className) {
6     var_dump($className);
7 });
8 spl_autoload_call(‘Order‘);

 1 namespace User;
 2 
 3 //直接载入Order
 4 #include(‘Order.php‘);
 5 //自动载入
 6 define(‘LIB_DIR‘, __DIR__ . DIRECTORY_SEPARATOR . ‘lib‘ . DIRECTORY_SEPARATOR);
 7 spl_autoload_register(function ($class) {
 8     $path = LIB_DIR . $class . ‘.lib.php‘;
 9     include ($path);
10 });
11 
12 spl_autoload_call(‘Order‘);
13 use Order;
14 
15 $orderList = new \Order\Orderlist();
16 $orderList->show_list();