Two notes

• We check the path: allow or deny
  remove the top directory from the path
  
  
  
  

  TIME.

  If it is necessary to establish whether the requested path is allowed in your script, which lies at the highest allowed level
  

   // let him eat 
   $ path [] = "some /../ path / to / file";
   $ path [] = "/ other / path / to / file";
   // and real allowed path
   $ restriced_path = dirname (__ FILE __). "/";
   // get real paths
   $ real_path [0] = realpath ($ path1);  // -> "/ path / to / your / restrict / path / to / file"
   $ real_path [1] = realpath ($ path2);  // -> "/ other / path / to / file"
   // check them
   foreach ($ real_path as $ pathn)
   {
      if (($ r = strpos ($ pathn, $ restriced_path))! == false && $ r == 0)
      {
         echo "Path $ pathn is allowed";
      }
      else
         echo "Path $ pathn is denied";
   }
  

  
  
  

  Two.

  If you need to cut the top level of directories
  Those. / dir / path / to / file -> / path / to / file
  ')
  

   $ path = "/ dir / path / to / file";
   $ path = ltrim ($ path, "\\ /");
   $ path = strpbrk ($ path, "\\ /");
   echo $ path;
  

  
  
  

  ---

  
  that's all