Dynamic PHP filepath to access ViewerJS from anywhere in the file system

[Penworks]

Im hosting ViewerJS in a web domain subfolder that uses an https subdomain, and trying to use ViewerJS from anywhere in the child folder system. I tried moving ViewerJS to the web root (domain document root) but this makes no difference. Im using an if/else statement for now for two levels and this works, but clearly is not adequate for future folders that might be created. I expect the folder tree to extend 4 levels. ANny ideas on how to make the if/else a dynamic dir/file call gratefully received. Im not a PHP coder, Im just a google hacker.

|--subdomain root
  |--file.pdf
  |--file.pdf
  |--file.pdf
      |--folder2
         |--file.pdf
         |--file.pdf
      |--folder3
         |--file.pdf
         |--file.pdf
         |--file.odp
             |--folder4
                |--file.pdf
                |--file.pdf
|--ViewerJS (folder)

if ($online_viewer == 'viewerjs') {

                            if ($current_path == 'subdomain root'){
                                echo '<iframe src="/ViewerJS/#../' . fm_enc($file) . '" frameborder="no" style="width:100%;min-height:460px" allowfullscreen webkitallowfullscreen></iframe>';
                            } else {
                               echo '<iframe src="/ViewerJS/#../' . fm_enc($current_path) . '/' . fm_enc($file) . '" frameborder="no" style="width:100%;min-height:460px" allowfullscreen webkitallowfullscreen></iframe>';
                            }

[Penworks]

Im updating this post because Ive solved my problem.

I believe this is useful for others to know as many people want to move away from being Google or Microsoft dependent and embrace open source solutions. Dynamic path ViewerJS offers a solution for PDF and open document format viewing.

I am working with the Tiny File Manager (TFM) script for online file repository management. Its a brilliant script, and uses either Google Doc Viewer or the Microsoft Viewer as doc view options.. Google Doc Viewer has a 25mb file size limit. Microsoft didnt seem very good quality. I wanted another solution that was hosted in local folders.

The PHP I wrote is dependent on the way TFM variables work, so variables can be altered according to needs. Ive included the full if/else if that TFM has for running the viewer. This works dynamically to 5 levels (0,1,2,3,4). Any folder you create in the file tree will work to that level.

/* TFM if/else if statement in full. I have included commenting for what's going on. */*

  if ($is_onlineViewer) {
                    if ($online_viewer == 'google') {
                        echo '<iframe src="https://docs.google.com/viewer?embedded=true&hl=en&url=' . fm_enc($file_url) . '" frameborder="no" style="width:100%;min-height:460px"></iframe>';

 /* Penworks REMOVED MICROSOFT VIEWER OPTION */
                    /* } else if ($online_viewer == 'microsoft') {
                        echo '<iframe src="https://view.officeapps.live.com/op/embed.aspx?src=' . fm_enc($file_url) . '" frameborder="no" style="width:100%;min-height:460px"></iframe>'; }*/

/* Penworks ADDED VIEWERJS VIEWER OPTION */

                   } else if ($online_viewer == 'viewerjs') {

/* VIEWERJS DYNAMIC FOLDER/FILE PATH OPTIONS */ 

                        /*NB $current_path = array_slice(explode("/", $path), -1)[0];*/
                        $sub_path = array_slice(explode("/", $path), 5)[1];
                        $sub_path1 = array_slice(explode("/", $path), 5)[2];
                        $sub_path2 = array_slice(explode("/", $path), 5)[3];
                        $sub_path3 = array_slice(explode("/", $path), 5)[4];
                        $sub_path4 = array_slice(explode("/", $path), 5)[5];
                    
 /* WORKING TO 5 LEVELS */
                                
               if ($current_path !=='home_dir' && $current_path == ($sub_path1)){
                  echo '<iframe id="iframe-size" src="/ViewerJS/#../' . fm_enc($current_path) . '/' . fm_enc($file) . '" frameborder="no" width="100%" allowfullscreen webkitallowfullscreen></iframe>';
                } 

                elseif ($current_path !=='home_dir' && $current_path == ($sub_path2) ){
                   echo '<iframe id="iframe-size" src="/ViewerJS/#../' . fm_enc($sub_path1) . '/' . fm_enc($current_path) . '/' . fm_enc($file) . '" frameborder="no" width="100%" allowfullscreen webkitallowfullscreen></iframe>';
                } 

                elseif ($current_path !=='home_dir' && $current_path == ($sub_path3) ){
                   echo '<iframe id="iframe-size" src="/ViewerJS/#../' . fm_enc($sub_path1) . '/' . fm_enc($sub_path2) . '/' . fm_enc($current_path) . '/' . fm_enc($file) . '" frameborder="no" width="100%" allowfullscreen webkitallowfullscreen></iframe>';
                } 

                 elseif ($current_path !=='home_dir' && $current_path == ($sub_path4) ){
                   echo '<iframe id="iframe-size" src="/ViewerJS/#../' . fm_enc($sub_path1) . '/' . fm_enc($sub_path2) . '/' . fm_enc($sub_path3) .'/' . fm_enc($current_path) . '/' . fm_enc($file) . '" frameborder="no" width="100%" allowfullscreen webkitallowfullscreen></iframe>';
                } 

                elseif ($current_path  == 'home_dir'){
                    echo '<iframe id="iframe-size" src="/ViewerJS/#../' . fm_enc($file) . '" frameborder="no" width="100%" allowfullscreen webkitallowfullscreen></iframe>';
                }

                else {
                 echo  '<span class="level level-title">Unfortunately, the file is not found in this universe. </span>';
               }
        }

It is VERY likely that proper coders can make a better version of this, or that there might already be better solutions around (I didnt find them).

I will add a link to a blogpost later that goes into more detail for those that might be interested. In due course I'll share a forked version of TFM in GitHub, with all the changes Ive done including the ViewerJS work.