public static function init()
 {
     if (isset($_GET["pkz"]) && is_numeric($_GET["pkz"])) {
         self::$pkz = $_GET["pkz"];
     }
     if (isset($_GET["start"]) && is_numeric($_GET["start"])) {
         self::$pkz = $_GET["start"];
     }
     if (isset($_GET["stop"]) && is_numeric($_GET["stop"])) {
         self::$pkz = $_GET["stop"];
     }
     if (isset($_GET["title"])) {
         self::$title = htmlentities($_GET["title"]);
     }
     if (isset($_GET["statusP"]) && $_GET["statusP"] != "0") {
         self::$statusP = 1;
     }
     if (isset($_GET["offercolorder"]) && $_GET["offercolorder"] != "0") {
         self::$statusP = 1;
     }
     if (isset($_GET["zps"])) {
         self::$zps = preg_replace("/[^a-zA-Z0-9_äöüÄÖÜ ]/", "", $_GET["zps"]);
     }
     if (isset($_GET["filter_order"])) {
         self::$zps = $_GET["filter_order"];
     }
     if (isset($_GET["filter_order_dir"])) {
         self::$zps = $_GET["filter_order_dir"];
     }
     if (isset($_GET["showbirthyear"]) && $_GET["showbirthyear"] == "0") {
         self::$showbirthyear = 1;
     }
     if (isset($_GET["showElo"]) && $_GET["showElo"] == "0") {
         self::$showElo = 1;
     }
     if (isset($_GET["showstatus"]) && $_GET["showstatus"] == "0") {
         self::$showstatus = 1;
     }
     if (isset($_GET["showtitle"]) && $_GET["showtitle"] == "0") {
         self::$showtitle = 1;
     }
     if (isset($_GET["showevaluation"]) && $_GET["showevaluation"] == "0") {
         self::$showevaluation = 1;
     }
     if (isset($_GET["showrank"]) && $_GET["showrank"] == "0") {
         self::$showrank = 1;
     }
 }