[PHP]Sprawdzenie klasy Opcje

[minolone]

Witam.
Prosze was o sprawdzenie klasy oraz wyrzucenie mi wszystkich błędów co jest nie tak jak być powinno.
Jest nie skończona ale wszytsko działa tak jak chciałem.

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<?php
 
    print_r($_POST);
 
    class AirConditioning {
 
        const HOME = 20; 
        const HOME_ROOF = 0.2;
        const COMPANY = 10;
        const COMPANY_PERCENT = 0.1;
        const COMPANY_ROOF = 0.1;
        const PEOPLE = 0.1;
 
        private $people;
        //public $window;
        private $roof;
 
        public function __construct($room, $height, $area, $people, $window, $roof) {
            $this->room = $room;
            $this->height = $height;
            $this->area = $area;
            if(!empty($window)) $this->window = $window;
            if(!empty($people)) $this->people = $people;
            if(!empty($roof)) $this->roof = $roof;
        }
 
        public function check() {
            if($this->room == 0) {
                return $this->home($this->height, $this->area);
            }
            if($this->room == 1) {
                return $this->company($this->height, $this->area);
            }
        }
 
        public function home($height, $area) {
            $count = $height*$area/self::HOME;
 
            if($this->roof == 1) {
                $roof = self::HOME_ROOF;
            }
 
            if($this->people > 0) {
                $people = $this->people($this->people);   
            }
 
            if(isset($roof) AND $roof > 0) {
                $count = $count+$count*$roof;
            }
 
            if(isset($people) AND $people > 0) {
                $count = $count+$people;
            }
 
            return $count;
        }
 
        public function company($height, $area) {
            $count = $height*$area;
            $count = $count/self::COMPANY;
            $add = self::COMPANY_PERCENT;
 
            if($this->roof == 1) {
                $add += self::COMPANY_ROOF;
            }
 
            if($this->people > 0) {
                $people = $this->people($this->people);   
            }
 
            if(isset($roof) AND $roof > 0) {
                $count = $count+$count*$roof;
            }
 
            if(isset($people) AND $people > 0) {
                $count = $count+$people;
            }
 
            return $count;
        }
 
        public function people($people) {
            $people = $people*self::PEOPLE;
            return $people;
        }
 
    } 
 
?>
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