For FCKEditor 2.3.1 (with PHP)

1. Edit FCKeditor/editor/filemanager/browser/default/browser.html:

After

if ( sServerPath.length > 0 )
    oConnector.ConnectorUrl += 'ServerPath=' + escape( sServerPath ) + '&' ;

Add

var sServerAbsolutePath = GetUrlParam( 'ServerAbsolutePath' ) ;
if ( sServerAbsolutePath.length > 0 )
    oConnector.ConnectorUrl += 'ServerAbsolutePath=' + escape( sServerAbsolutePath ) + '&' ;

2. In FCKeditor/editor/filemanager/browser/default/connectors/php/config.php, set $Config['Enabled'] = true ;

3. Edit FCKeditor/editor/filemanager/browser/default/connectors/php/connector.php:

After

else
{
    // Map the "UserFiles" path to a local directory.
    $GLOBALS["UserFilesDirectory"] = GetRootPath() . $GLOBALS["UserFilesPath"] ;
}

Add

if (isset($_GET["ServerAbsolutePath"]))
{
    $GLOBALS["UserFilesDirectory"] = $_GET["ServerAbsolutePath"] ;
}

4. In FCKeditor/editor/filemanager/upload/php/config.php, set $Config['Enabled'] = true ;

5. Edit FCKEditor/editor/filemanager/upload/php/upload.php:

After

if ( isset( $Config['UserFilesAbsolutePath'] ) && strlen( $Config['UserFilesAbsolutePath'] ) > 0 )
    $sServerDir = $Config['UserFilesAbsolutePath'] ;
else
    $sServerDir = GetRootPath() . $Config["UserFilesPath"] ;

Add

if (isset($_GET["ServerAbsolutePath"]))
    $sServerDir = $_GET["ServerAbsolutePath"] ;

And After

$sFileUrl = $Config["UserFilesPath"] . $sFileName ;

Add

if (isset($_GET["ServerPath"]))
    $sFileUrl = $_GET["ServerPath"].$sFileName;

6. When instantiating the FCKEditor in your application:

include "../FCKeditor/fckeditor.php";

$username = $_SESSION["_username"];
$fckeditor_base_path = "/FCKeditor/";
$fckeditor_upload_virtual_directory = "/app1/uploads/".$username."/";
$fckeditor_upload_physical_directory = "C:\\webapps\\app1\\uploads\\".$username."\\";

$fckeditor = new FCKeditor("content") ;
$fckeditor->BasePath = $fckeditor_base_path;
$fckeditor->Value = "";
$fckeditor->Width = "95%";
$fckeditor->Height = "550";
$fckeditor->Config["LinkBrowserURL"] = ($fckeditor->BasePath)."editor/filemanager/browser/default/browser.html?Connector=connectors/php/connector.php&ServerPath=".$fckeditor_upload_virtual_directory."&ServerAbsolutePath=".$fckeditor_upload_physical_directory;
$fckeditor->Config["ImageBrowserURL"] = ($fckeditor->BasePath)."editor/filemanager/browser/default/browser.html?Type=Image&Connector=connectors/php/connector.php&ServerPath=".$fckeditor_upload_virtual_directory."&ServerAbsolutePath=".$fckeditor_upload_physical_directory;
$fckeditor->Config["FlashBrowserURL"] = ($fckeditor->BasePath)."editor/filemanager/browser/default/browser.html?Type=Flash&Connector=connectors/php/connector.php&ServerPath=".$fckeditor_upload_virtual_directory."&ServerAbsolutePath=".$fckeditor_upload_physical_directory;
$fckeditor->Config["LinkUploadURL"] = ($fckeditor->BasePath)."editor/filemanager/upload/php/upload.php?ServerPath=".$fckeditor_upload_virtual_directory."&ServerAbsolutePath=".$fckeditor_upload_physical_directory;
$fckeditor->Config["ImageUploadURL"] = ($fckeditor->BasePath)."editor/filemanager/upload/php/upload.php?Type=Image&ServerPath=".$fckeditor_upload_virtual_directory."&ServerAbsolutePath=".$fckeditor_upload_physical_directory;
$fckeditor->Config["FlashUploadURL"] = ($fckeditor->BasePath)."editor/filemanager/upload/php/upload.php?Type=Flash&ServerPath=".$fckeditor_upload_virtual_directory."&ServerAbsolutePath=".$fckeditor_upload_physical_directory;
$fckeditor->Create();