Issue with PHP include with global path

问题

I have been facing an issue with the PHP includes. Based on the readings from internet, I have been using relative path to have the flexibility around.

As long as I refer to a path directly in each file, like

require_once '../includes/connection.php';  // it works fine.

The issue starts when I refer to this path with a global constant

require_once getDocumentRoot() . '/includes/connection.php',

as it says the below error.

Warning: require_once(/phpPractices/myApp/includes/connection.php): failed to open stream: No such file or directory in /Applications/XAMPP/xamppfiles/htdocs/phpPractices/myApp/dir1/list.php on line 19".

I had been reading so many threads in SO and following the advices like

Define a constant as DOCUMENT_ROOT with the base director of the file. (Like the one what it says here in SO -> https://stackoverflow.com/a/22912261/1001242)
Also attempted with various options like DIR, basedir(FILE) etc.,
Added my application directory (/phpPractices/myApp) to the include_path via set_include_path() method (as mentioned in PHP, How to set include path and http://php.net/manual/en/function.set-include-path.php)

My function getDocumentRoot() is defined as follows.

function getDocumentRoot()
{
    $loc_pos_2 = strpos($_SERVER['REQUEST_URI'], "/", 1);
    $baseDir = substr($_SERVER['REQUEST_URI'], 0, $loc_pos_2);
    $baseDir = $baseDir . "/myApp";
    return $baseDir;
}

Note: I could see that the file exists physically. However, file_exists() method returns false, which I don't understand why. Possibly it could have been a cause of concern?

FYI, my directory structure is as below.

htdocs
  phpPractices
    myApp --> Web App Root
      includes
         connection.php
      inc
         header.php
         footer.php
         global.php -- contains getDocumentRoot() method and included in header.php
      index.php
      dir1 --> my module specific dir
         list.php --> which needs 'connection.php'

My list.php contains the below

<?php

include_once '../inc/header.php'; // it works fine as I do relative to the path

//require_once '../includes/connection.php'; //works fine
require_once getDocumentRoot() . '/includes/connection.php'; // FAILS! :(

?>

But nothing helps! Any suggestion to get rid of this issue will be much appreciated.

Thanks in advance!

SOLUTION

Thanks to all the people whoever had replied. I got a new workaround that kinda helps me :)

1. For all the menu items with links: 

    I use my getDocumentRoot() method which provides me - 
     '/phpPractices/myApp/' --> which is relative to my Web App.

2. For all the include, require functions : 

    I defined a different constant as below & as per this link: 
        https://stackoverflow.com/a/1488293/1001242

    define('APP_BASE_PATH', $_SERVER['DOCUMENT_ROOT'] . '/myApp');

    which returns me the complete absolute path which works fine for file inclusion.

I had been meddling with these both. For the file inclusion, the getDocumentRoot()'s output of "/phpPractices/myApp" was failing as it was attempting to locate a directory named 'phpPractices' in the root ("/phpPractices/"), which was the root cause. Hence, I had split these into two and now works fine.

Thanks everyone. Much appreciated.

回答1:

Update your getDocumentRoot() function to return absolute path

function getDocumentRoot()
{
    return dirname(__FILE__);
}

or use dirname(__FILE__) in your require

来源：https://stackoverflow.com/questions/27586445/issue-with-php-include-with-global-path

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