Paths when both including and requesting AJAX

Question

I was wondering if there is a way of making a relative path to the main folder (where the index.php lies) from every file that needs to be included or requested by AJAX.

I want to combine both AJAX and PHP include so first time the page loads with PHP, and then to be able to refresh parts of the page with AJAX, but the files are the same and lie in subfolders.

I'm having problems with the path and although I can set an absolute path, then I have to change it every time the server changes. I want a relative path to where my project is, but not DOCUMENT_ROOT, because that one doesn't work with aliases. (or do you know how to make it work with aliases? )

Thanks !

EDIT* Here is how my directory structure looks:

[main_dir]/index.php - the main index file

[main_dir]/phpinc - the php include files - that work only with include (no AJAX call on them)

[main_dir]/modules - the modules are parts of the page , can be either included with PHP or AJAX called from anywhere (doesn't matter, they will be loaded as an individual HTML file, so the paths in PHP are relative to where the module is phisically situated.

When you include them in PHP, they will normally take the [main_dir] path (because index.php has included them)

So my problem is: from the module files I want to include some files in the phpinc folder, but it could either be ../phpinc/file.php or phpinc/file.php .

Is there a more elegant way than just putting an

if (is_dir("phpinc")) {
 $inc_path = "phpinc";   
} else if (is_dir("../phpinc")) {
 $inc_path = "../phpinc";
}

at the beginning of each module?
Hope this clarification is good enough.

Answer 1

UPDATED:

try to follow me:

i have this App structure

/realpath/
 - phpinc/
   - file.php
   - config.php
 - module/
   - module1.php
   - module2.php
 - index.php

realpath is the main dir where our App reside!

now

index.php have this code:

<?php
// this is your save life, must stay always on the top of main index
// OR into each page that are not included in the index file!
include ( 'phpinc/file.php' );

include ( MODULE_PATH . 'module1.php' );

echo '<script>'; 
 // now assuming you are running AJAX from here!    
 // you don't need to warry about the path!
echo '</script>'; 

echo '<p>Hello World!<p>';
echo APP_PATH; # /user/root/realpath/
echo '<br />'; 
echo PHPINC_PATH; # /user/root/realpath/phpinc/
echo '<br />';
echo PHPINC; # /user/root/realpath/phpinc/file.php
echo '<br />';
echo MODULE_PATH; # /realpath/module/
echo '<br />';
echo $html; # 555-555-555   aSeptik

?>

file.php have this code:

<?php
define ( APP_PATH , getcwd() .'/' );
define ( MODULE_PATH , APP_PATH . '/module/' );
define ( PHPINC_PATH , dirname(__FILE__) .'/' );
define ( PHPINC , realpath(__FILE__) );

?>

module1.php have this code:

<?php
include ( PHPINC_PATH . 'config.php' );

$html .= '<table>';
$html .= '<tr>';
$html .= '<td>'.$password.'</td>';
$html .= '<td>'.$username.'</td>';
$html .= '</tr>';
$html .= '</table>';
?>

config.php have this:

$password = '555-555-555';
$username = 'aSeptik';

As you can see you need to have the file.php always on top and declared only once for all descendant included file!

you now have your own path definition for resue as you need in your App!

Let me know!