php - PHP - 相对路径“需要”

Question

我的目录结构如下所示：

blog -> admin -> index.php
blog.php
db.php
functions.php

我一直在尝试include（require真的）blog.php，admin/index.php但面临很多错误。我正在学习 PHP 课程，并且讲师成功地做了同样的事情。

管理员/index.php：

require "../blog.php";

反过来，它的目录中还需要两个文件。

require "db.php";
require "functions.php";

Answer 1

If you find that relative include paths aren't working as expected, a quick fix is to prepend __DIR__ to the front of the path you're trying to include.

require __DIR__ . "/../blog.php";

It's reasonably clean, and you don't need to modify the include path or working directory.

Answer 2

您需要include_path在 php.ini 中设置。

如果要在运行时设置它，请使用set_include_path().

Answer 3

如果要包含此文件db.php and functions.php，index.php则必须编写此代码

require "../db.php";
require "../functions.php";

或者，如果您包含此文件，blog.php则编写此代码

require "db.php";
require "functions.php";

Answer 4

我喜欢以chdir($_SERVER['DOCUMENT_ROOT']). 这使我能够为我的所有包含获得一个很好且合乎逻辑的基本路径。