how to retrive the current FCKeditor version for PHP?

I'm trying to do a kind of info page of my system where to show all it's components versions.
Now I can't find out how to get the FCKeditor version.

Can anybody help me?

Thanks.

PS: I've found that it is kept in the 'fckeditorapi.js' but I don't know how can I retrieve it:

var FCKeditorAPI ;
function InitializeAPI()
{
   var oParentWindow = window.parent ;

   if ( !( FCKeditorAPI = oParentWindow.FCKeditorAPI ) )
   {
      // Make the FCKeditorAPI object available in the parent window. Use
      // eval so this core runs in the parent's scope and so it will still be
      // available if the editor instance is removed ("Can't execute code
      // from a freed script" error).

      // Note: we check the existence of oEditor.GetParentForm because some external
      // code (like JSON) can extend the Object prototype and we get then extra oEditor
      // objects that aren't really FCKeditor instances.
      var sScript =
         'window.FCKeditorAPI = {' +
            'Version : "2.6.4.1",' +
            'VersionBuild : "23187",' +
...