class base  implements JsonSerializable {

  public function jsonSerialize() {
   return get_object_vars($this);}
   public function Area()
  {

  }
  }
//include("base.inc");
  class Circle  extends base {

        public $type = circle;
        public function __construct( $r)
    {
        $this->radius = $r;
    }

      public function show_one() {

          echo $this->one;
          echo $this->radius;

      }
      public function Area()
    {
        return pi() * pow($this->radius, 2);
    }
    public function __toString() {
        return  "radius: {$this->radius}\n";
    }
     /*public function jsonSerialize() {
     //return get_object_vars($this);}
        return [
            'type' => $this->type,
            'radius' => $this->radius,
            'ploshad' => $this->Area()
        ];}
        */
  }
class Rectangle extends base
{
  private $width;
  private $height;
  public  $type= Rectangle;

  public function __construct($x, $y)
  {
    $this->width = $x;
    $this->height = $y;
  }




  public function Area()
  {
    return $this->width * $this->height;
  }
 /* public function jsonSerialize() {
   //return get_object_vars($this);}
        return [
            'type' => $this->type,
            'a' => $this->width,
            'b' => $this->height,
            'ploshad' => $this->Area()
        ];}*/
}
 $a = new Circle(rand(1,10));
  $b = new Rectangle(rand(1,10),rand(1,10));
obj_decode($a);
 $d = json_encode($a);
 $d= $d . ',' . json_encode($b);
 $d='['.$d.']';
var_dump($d);
 file_put_contents('store.json', $d);
$path = file_get_contents("store.json");
$json = json_decode($path, true);
/*
for($i=0;$i<count($json);$i++) {
    switch ($json[$i]['type']) {
        case "circle":
            $figure = new Circle($json[$i]['radius']);
            break;
        case "rectangle":
            $figure = new Rectangle($json[$i]['a'], $json[$i]['b']);
            break;
    }
    $json[$i]['s'] = $figure->Area();
}
*/
usort($json, function($a, $b) {
    if($a['s'] === $b['s'])
        return 0;
    return $a['s'] > $b['s'] ? -1 : 1;
});

for($i=0;$i<count($json);$i++) {
    switch ($json[$i]['type']) {
        case "circle":
            echo "Круг. Рудиус=".$json[$i]['radius'].". Площадь:\n".$json[$i]['ploshad']."</br>";
            break;
            case "Rectangle":
            echo "Прямоугольник. a=".$json[$i]['a'].", b=".$json[$i]['b'].". Площадь:\n".$json[$i]['ploshad']."</br>";
            break;

    }
}