<?php
if (!isset($_GET["index"])) {
   exit() ;
} else {
   $index = $_GET["index"];
   if (is_numeric($index) and file_exists("puzzles/puzzle$index.xml")) {
      $filename = "counters/counter$index";
      $data = 0;
      if (file_exists($filename)) {
         $file = fopen($filename, "r");
         $data = fread($file, filesize($filename));
         fclose($file);
      }
      
      if (isset($_GET["inc"])) {
         $inc = $_GET["inc"];
         if (is_numeric($inc) && $inc!=0) {
            $data = $data + 1;
            $file = fopen($filename, "w");
            fwrite($file, $data);
            fclose($file);
         }
      }

      if (isset($_GET["js"]) && is_numeric($_GET["js"]) && $_GET["js"] != 0) {
         echo "document.write('This puzzle has been completed $data time(s).')" ;
      } else {
         echo "$data";
      }
   }
}
?>