尝试使用我创建的名称空间时出现错误 [英] getting an error while trying to use the namespace I created

问题描述

名为tester.php的脚本

<?php
namespace my;
class Tester {
    public function greet() {
        echo "Hello ! <br />";
    }
}   

一个名为 tester1.php 的新脚本:

<?php
use my;

$obj = new Tester();
$obj->greet();

当我运行tester1.php时，出现此错误:

When I run tester1.php I get this error:

Warning: The use statement with non-compound name 'my' has no effect
in /opt/lampp/htdocs/tester_1.php on line 2

Fatal error: Class 'Tester' not found in /opt/lampp/htdocs/tester_1.php on line 4

为什么会出现此错误?这两个脚本都在同一目录/opt/lampp/htdocs/中.

Why am I getting this error ? Both these scripts are in the same directory /opt/lampp/htdocs/.

推荐答案

use运算符用于别名化类/接口/命名空间名称，而不是导入名称空间以便使用.要使用名称空间，只需将namespace my;放在tester1.php文件的顶部(并且还包括原始文件，以便可以使用您的类定义).

The use operator is meant for aliasing a class/interface/namespace name, rather than importing a namespace so it can be used. To use your namespace, you just need to put namespace my; at the top of your tester1.php file (and also include the original file so that your class definition is available).

<?php
namespace my;
include("tester.php");

$obj = new Tester();
$obj->greet();

如果您想为其他名称起别名，则可以使用use，例如

If you wanted to alias to another name, then you can use use, for example,

<?php
namespace my;
use my\Tester as Blah;
include("tester1.php");

$obj = new Blah();
$obj->greet();

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