opraveno

<?php
session_start();

class Hledani {
  private $trefa;
  private $vedle;
  private $prachy;
  private $sance;

  public function __construct() {
    $this->trefa = 0;
    $this->vedle = 0;
    $this->prachy = 1000;
    $this->sance = 33;
  }

  public function zkuz_to($castka) {
    $vyhra = rand(1, 100) < $this->sance;
    if($vyhra) {
      $this->trefa++;
      $this->sance--;
      $this->prachy += $castka * 2;
      $text = "Uhodli jste<br/>\n";
    }
    else {
      $this->vedle++;
      $this->sance++;
      $this->prachy -= $castka;
      $text = "Smula<br/>\n";
    }
    $text .= "dobre: " . $this->trefa . "<br/>\n";
    $text .= "spatne: " . $this->vedle . "<br/>\n";
    $text .= "vase penize: " . $this->prachy;
    return $text;
  }

}

if(isset($_GET["reset"])) {
  unset($_SESSION["kulicky"]);
}

if(isset($_SESSION["kulicky"])) {
  $hra = unserialize($_SESSION["kulicky"]);
}
else {
  $hra = new Hledani();
  echo "mate 1000 penez";
}

if(isset($_GET["hadej"])) {
  echo $hra->zkuz_to($_GET["sazka"]);

}
?>
<br/>
<form action="hledani_kulicky.php" method="get">
  Vase sazka: <input name="sazka"><br/>

  <input type="submit" name="hadej" value="Tady jsem">
  <input type="submit" name="hadej" value="Ne, tady">
  <input type="submit" name="hadej" value="Nene, tady!">
  <br/>
  <input type="submit" name="reset" value="Reset">
</form>


<?php
$_SESSION["kulicky"] = serialize($hra);
?>