php包含文件和目录

Question

Lets say I have two files in directory new_folder: a.php and b.php

In the file of a.php there is a statement:

include_once 'b.php'

In addition, I have a file demo.php in a parent folder, in the demo file there is a statement:

include_once 'new_folder/a.php'

I.E. the folder structure is:

demo.php
new_folder
   - a.php
   - b.php

Why if I write in the a.php file:

• include_once 'b.php' - correct path
• include_once './b.php' - incorrect path
• include_once 'new_folder/b.php' - incorrect path

Answer 1

Try This

require_once('../b.php');