[PHP] Coding-challenge-maman-les-petits-avions

class Plane{

    public $name = NULL;
    public $flying_time = 0;
    public $flying_time_in_altitude = 0;
    public $maximum_altitude = 0;

    private $name_sum = 0;
    private $flying_map = NULL;

    public function __construct($name = NULL){
        $this->name = $name;
        $this->name_sum = 0;
        $this->name_sum = array();
        return $this;
    }

    public function fly(){
        $this->compute_name_value();
        $this->compute_flying_map();
        echo 'Avion : ' . $this->name . '<br/>';
        echo 'Temps de vol : ' . $this->flying_time. '<br/>';
        echo 'Temps de vol en altitude : ' . $this->flying_time_in_altitude. '<br/>';
        echo 'Altitude maximum : ' . $this->maximum_altitude . '<br/>';
        echo '<br/>';
    }

    private function compute_name_value(){
        $sum = 0;
        if(!empty($this->name)){
            $alpha = range('a','z');
            $arr_name = str_split(strtolower($this->name));
            foreach($arr_name as $char){
                $sum += 1+array_search($char,$alpha);
            }
        }
        $this->name_sum = $sum;
    }

    private function compute_flying_map(){
        $flying_map = array();
        $this->flying_time = 0;
        $this->flying_time_in_altitude = 0;
        $this->maximum_altitude = 0;

        $value = $this->name_sum;
        while($value>1){
            $flying_map[] = $value;
            if($value >= $this->name_sum){$this->flying_time_in_altitude++;}
            $this->maximum_altitude = max($this->maximum_altitude,$value);
            $value = $value%2 == 0 ? ceil($value/2) : 1+($value*3);
        }
        $flying_map[] = 1;

        $this->flying_map = $flying_map;
        $this->flying_time = count($this->flying_map);
        $this->flying_time_in_altitude = 0;
    }
}

$plane = new Plane('o');
$plane->fly();

$plane = new Plane('Enterprise');
$plane->fly();

$plane = new Plane('FauconMillenium');
$plane->fly();