php如何相对路径

Question

How to do relative pathing? how to use __dir__

here is my file structure before

public_html
  ├── config
  |    |__config.php
  ├── core
  |    |__init.php
  ├── helper
  |    |__helper.php
  ├── libraries
  |    |__page1.php
  ├── templates
  │   ├── page1template.php
  │
  │__index.php
  │__page1.php

After having too many pages. I want to tiddy them up into "rep" folder and "admin" folder. so my new file structure look like this

public_html
  ├── config
  |    |__config.php
  ├── core
  |    |__init.php
  ├── helper
  |    |__helper.php
  ├── libraries
  |    |__page1.php
  ├── templates
  │   ├── page1template.php
  │
  │__index.php
  |
  ├── rep
  |    |__page1.php
  ├── admin
  │   ├── page1.php

The problem is, my requires and includes are still absolute pathing. see a sample below

my init file

//Start Session
session_start();

//Include Configuration
require_once('config/config.php');

//Helper Function Files
require_once('helpers/system_helper.php');
require_once('helpers/format_helper.php');

//Autoload Classes
function __autoload($class_name){
    require_once('libraries/'.$class_name .'.php');
} 

my page1.php

 <?php require('core/init.php'); ?>
     //Get Template & Assign Vars
     $template = new Template('templates/rep/page1.php');

if I add an "../" in front of every path. then the page will loads correctly. see below

require_once('../config/config.php');
require_once('../helpers/system_helper.php');
require_once('../helpers/format_helper.php');
require_once('../libraries/'.$class_name .'.php');
require('../core/init.php'); 
$template = new Template('../templates/rep/page1.php');

but then my index.php will break because index is in the root folder, so the new path is wrong relative to it. I found two question with related issue. I suspect it is related to using __dir__ to replace ../ but I dont know where to put it.

PHP include relative path

Are PHP include paths relative to the file or the calling code?

Answer 1

For me personally, I try to make includes relative to the file doing the including, if I'm sure the structure is supposed to be a certain way. For instance, you could make a file at core/loader.php right next to core/init.php ... Then if you assume the relative structure between the loader and the other files would always remain the same, core/loader.php could be something like

<?php

// Get the path of whatever folder is holding the core/config/etc folders
$main_dir=RealPath(DirName(__FILE__).'/../');

require("{$main_dir}/config/config.php");
require("{$main_dir}/helpers/system_helper.php");
// etc

?>

The point here being that you can now move that set of folders anywhere you want (recommendation: outside public_html), and they should still load, as long as you require'ed the right path to the loader.