/**
  * Load data of search
  * 
  * Loads route data from overpass api.
  */
 public function getData()
 {
     // add GET to variables
     $this->variables = $_GET;
     //array of keys that should be requested
     $keys = array("ref", "network", "operator", "to", "from");
     // build link
     $query = '<query type="relation">';
     foreach ($keys as $key) {
         if (isset($this->variables[$key]) && $this->variables[$key]) {
             $query .= '<has-kv case="ignore" k="' . $key . '" regv="' . htmlspecialchars($this->variables[$key]) . '"/>';
         }
     }
     $query .= '<has-kv k="type" v="route"/><has-kv k="route" regv="train|tram|light_rail|subway"/></query><print/>';
     if (Overpass::sendRequest($query)) {
         $this->content = Overpass::$result;
         return true;
     } else {
         $this->error = Overpass::$error;
         return false;
     }
 }
 /**
  * Load data of route
  * 
  * Loads route data from overpass api, when not available yet.
  */
 public function getData()
 {
     if (isset($_POST["id"])) {
         $_GET["id"] = $_POST["id"];
         if (isset($_POST["train"])) {
             $_GET["train"] = $_POST["train"];
         }
     }
     // no id set
     if (!isset($_GET["id"])) {
         // show error
         return_error("no_id", "full");
         die;
     }
     // get route id
     $get_id = $_GET["id"];
     // id is not a valid number
     if (!is_numeric($get_id) || round($get_id) != $get_id) {
         // exception for user routes of the scheme 12345_0
         if (preg_match("/^[0-9]+[_][0-9]+\$/", $get_id)) {
             $file = "./osmdata/user" . $get_id . ".osm";
             if (file_exists($file)) {
                 $spl = preg_split("[_]", $get_id);
                 $this->id = $spl[0];
                 $this->filexml = $file;
                 $this->custom = true;
                 $this->custom_id = $get_id;
                 return;
             } else {
                 return_error("invalid_id", "full");
                 die;
             }
         }
         // show error
         return_error("invalid_id", "full");
         die;
     }
     // save id
     $this->id = $get_id;
     if (isset($_FILES["osmfile"])) {
         $uploaddir = './osmdata/';
         $uploadfile = $uploaddir . "user" . $this->id . "_";
         $i = 0;
         while (file_exists($uploadfile . $i . ".osm")) {
             $i++;
         }
         $uploadfile .= $i . ".osm";
         // try uploading file
         if (move_uploaded_file($_FILES['osmfile']['tmp_name'], $uploadfile)) {
             if (!@simplexml_load_file($uploadfile)) {
                 return_error("invalid_xml_file", "full");
                 unlink($uploadfile);
                 die;
             }
         } else {
             return_error("upload_error", "full");
             print_r($_FILES);
             log_error("File upload error:" . print_r($_FILES["osmfile"]["error"]));
             die;
         }
         $this->filexml = $uploadfile;
         $this->custom = true;
         $this->custom_id = $get_id . "_" . $i;
     } else {
         // build file name
         $file_name = "osmdata/data" . $this->id . ".osm";
         // check if data needs to be refreshed
         $refresh = true;
         // default value
         // relation was already loaded
         if (file_exists($file_name)) {
             // check age of data
             $this->filemtime = filemtime($file_name);
             // data is younger than 7 days
             if ($this->filemtime > time() - 7 * 24 * 60 * 60) {
                 $refresh = false;
             }
         }
         // forced refresh
         if (isset($_GET["rf"]) && $_GET["rf"] == "1") {
             $refresh = true;
         }
         if (isset($_GET["maxspeed"]) && $_GET["maxspeed"] > 0) {
             $this->vmz = $_GET["maxspeed"];
         }
         // get data from overpass-api when needed
         if ($refresh) {
             // build link to overpass api
             $overpass_query = "[out:xml];(relation(" . $get_id . ");rel(br););out;(relation(" . $get_id . ");>>;);out;";
             if (Overpass::sendRequest($overpass_query)) {
                 $this->refresh_success = true;
                 file_put_contents($file_name, Overpass::$result);
                 $this->filemtime = time();
             } else {
                 $this->refresh_success = false;
             }
         }
         $this->filexml = $file_name;
     }
 }