Question

我在目录Main中有文件Helpers;

Main内的目录Helper内容为Helpers\Helper。

我尝试将index.php中的课程<? namespace Program; use Helpers\Helper; class Index { public function __construct() { $class = new Helper(); } }注入：

d = {'a':5 , 'b':4, 'c':3, 'd':3, 'e':1}

x = sorted(((v,k) for k,v in d.items()))
print(x[-2][1])
print(x[-3][1])

但它不起作用。

如何使用命名空间并在PHP中使用？

Answer 1

根据您的描述，您的目录结构应该与此类似：

    Main*
        -- Index.php
        |
        Helpers*
               --Helper.php

如果您关于PSR-4标准，那么您的班级定义可能类似于以下所示：

<强>的index.php

    <?php
        // FILE-NAME: Index.php.
        // LOCATED INSIDE THE "Main" DIRECTORY
        // WHICH IS PRESUMED TO BE AT THE ROOT OF YOUR APP. DIRECTORY

        namespace Main;            //<== NOTICE Main HERE AS THE NAMESPACE...

        use Main\Helpers\Helper;   //<== IMPORT THE Helper CLASS FOR USE HERE   

        // IF YOU ARE NOT USING ANY AUTO-LOADING MECHANISM, YOU MAY HAVE TO 
        // MANUALLY IMPORT THE "Helper" CLASS USING EITHER include OR require
        require_once __DIR__ . "/helpers/Helper.php";

        class Index {

            public function __construct(){
                $class = new Helper();
            }

        }

<强> Helper.php

    <?php
        // FILE NAME Helper.php.
        // LOCATED INSIDE THE "Main/Helpers" DIRECTORY


        namespace Main\Helpers;     //<== NOTICE Main\Helpers HERE AS THE NAMESPACE...


        class Helper {

            public function __construct(){
                // SOME INITIALISATION CODE
            }

        }

如何使用命名空间并在PHP中使用？

1 个答案: