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function PclZipUtilPathReduction($p_dir)
  {
    $v_result = "";

    // ----- Look for not empty path
    if ($p_dir != "") {
      // ----- Explode path by directory names
      $v_list = explode("/", $p_dir);

      // ----- Study directories from last to first
      $v_skip = 0;
      for ($i=sizeof($v_list)-1; $i>=0; $i--) {
        // ----- Look for current path
        if ($v_list[$i] == ".") {
          // ----- Ignore this directory
          // Should be the first $i=0, but no check is done
        }
        else if ($v_list[$i] == "..") {
		  $v_skip++;
        }
        else if ($v_list[$i] == "") {
		  // ----- First '/' i.e. root slash
		  if ($i == 0) {
            $v_result = "/".$v_result;
		    if ($v_skip > 0) {
		        // ----- It is an invalid path, so the path is not modified
		        // TBC
		        $v_result = $p_dir;
                $v_skip = 0;
		    }
		  }
		  // ----- Last '/' i.e. indicates a directory
		  else if ($i == (sizeof($v_list)-1)) {
            $v_result = $v_list[$i];
		  }
		  // ----- Double '/' inside the path
		  else {
            // ----- Ignore only the double '//' in path,
            // but not the first and last '/'
		  }
        }
        else {
		  // ----- Look for item to skip
		  if ($v_skip > 0) {
		    $v_skip--;
		  }
		  else {
            $v_result = $v_list[$i].($i!=(sizeof($v_list)-1)?"/".$v_result:"");
		  }
        }
      }

      // ----- Look for skip
      if ($v_skip > 0) {
        while ($v_skip > 0) {
            $v_result = '../'.$v_result;
            $v_skip--;
        }
      }
    }

    // ----- Return
    return $v_result;
  }
  // --------------------------------------------------------------------------------

  // --------------------------------------------------------------------------------
  // Function : PclZipUtilPathInclusion()
  // Description :
  //   This function indicates if the path $p_path is under the $p_dir tree. Or,
  //   said in an other way, if the file or sub-dir $p_path is inside the dir
  //   $p_dir.
  //   The function indicates also if the path is exactly the same as the dir.
  //   This function supports path with duplicated '/' like '//', but does not
  //   support '.' or '..' statements.
  // Parameters :
  // Return Values :
  //   0 if $p_path is not inside directory $p_dir
  //   1 if $p_path is inside directory $p_dir
  //   2 if $p_path is exactly the same as $p_dir
  // --------------------------------------------------------------------------------