USE导入空间/别名-0508

1. php
   

   
   

   实例

   <?php     //1.php
   class Person{
       function __construct(){
               echo 'I am one!<br/>';
           }}

   
   

   
   

2. 实例

   <?php
      namespace School\Parents;
       class Man{
           function __construct(){
               echo 'Listen to teachers!<br/>';
           }
       }
       namespace School\Teacher;
       class Person{
           function __construct(){
               echo 'Please study!<br/>';
           }
       }
       namespace School\Student;
       require_once './1.php';
       require_once './2.php';
       class Person{
           function __construct(){
               echo 'I want to play!<br/>';
           }
       }
       new Person();                   //输出I want to play!
       new \School\Teacher\Person();   //输出Please study!
       //new Teacher\Person();           //报错
      // ----------
       use School\Teacher;
       new Teacher\Person();           //输出Please study!
     //  ----------
       use School\Teacher as Tc;
       new Tc\Person();           //输出Please study!
      // ----------
       //use \School\Teacher\Person;
       new \Person();           //报错
      // ----------
       // use \School\Parent\Man;
       // new Man();           //报错