self::$_db = new PDO("mysql:host=" . self::$_host . ";dbname=" . self::$_db_name, self::$_user, self::$_password, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'"));
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    function getAllTeams() {
      $statement = self::$_db->prepare("select * from team");
      $statement->execute();
      return $statement->fetchAll(PDO::FETCH_ASSOC);
    }