PHP opendir() not opening apache alias directory

Question

I've defined an Alias directory in Apache (2.4) to access and list some files that are outside of my document root, and it works perfect when opening an specific file, but i need to iterate throw the whole directory and function opendir is giving me the following error:

Warning: opendir(http://192.168.0.165/archivosHCL/archivosOOSS): failed to open dir: not implemented in C:\Apache24\htdocs\clinica\verArchivos.php on line 41.

Indexes are enabled in the alias directory definition, so if i put "http://192.168.0.165/archivosHCL/archivosOOSS" on the browser, it shows the list of files correctly.

Here's my alias directory definition:

Alias /archivosHCL "C:/ARCHIVOS/HCL"
    <Directory "C:/ARCHIVOS/HCL">
      Options Indexes FollowSymLinks Includes ExecCGI
      AllowOverride All
      Require all granted
    </Directory>