使路径可在PHP的各个级别的文件夹中访问 [英] Make path accessible at various level of folder on PHP

问题描述

假设我有一个文件夹，上面有一些文件夹和页面:

Assume that I have a folder with some folders and pages on it:

• 文件夹A
  • PageA1.php
  • FolderA
    • PageA1.php
    • 文件夹B1
      • PageB11.php
      • FolderB1
        • PageB11.php
        • PageB21.php
        • PageC1.php

        在 PageB11 上，我有:

        require_once 'FolderB2/PageB21.php';
        

        在 PageB1 上调用 PageB11 时:

        require_once 'FolderB1/PageB11.php';
        

        一切正常.但是现在的问题是，在 PageB11 上也有一个调用页面本身的函数( PageB11 )，然后显示错误:

        It's work fine. But now the problem is, while on PageB11 also have a function that call the page itself (PageB11), then the error showed:

        Warning: require_once(FolderB2/PageB21.php): failed to open stream: No such file or directory in Path\FolderB\FolderB1\PageB11.php on line X

        当我将 PageB11 上的require_once行更改为:require_once '../FolderB2/PageB21.php';时，就可以了！

        When I changed the require_once line on PageB11 become: require_once '../FolderB2/PageB21.php';, it's work!

        我想做的是，如何使所有这些文件都可以在不同级别的文件夹中访问?有可能做到这一点吗?谢谢.

        What I wanna do is, how to make all of it accessible at various level of folder? Is is possible to do that? Thanks..

        推荐答案

        如上所述，处理此类情况的最佳方法是通过其绝对路径引用每个文件.这是从文件系统根目录开始的路径，这与当前文件相对指定的相对路径不同.

        As stated, the best way of handling such situations, is to refer to each file by its absolute path. This is the path from the root of the filesystem, unlike a relative path which is given relative by the current file.

        在PHP中，您有一个神奇的常量__DIR__，它提供了当前文件的绝对路径.在每个include/require之前加上这个，您将再也不会遇到该问题.

        In PHP you have a magical constant __DIR__, which gives the absolute path of the current file. Prepend every include/require with that, and you'll never see that problem again.

        require_once __DIR__ . '/../FolderB2/PageB21.php';
        

        您还可以使用 realpath() .

        You can also make use of realpath().

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