Bicycle.php

<?php

// Bicycle.php

class Bicycle
{
    /**
     * @var string
     */
    private $color;

    /**
     * @var integer
     */
    private $currentSpeed;
    /**
     * @var integer
     */
    private $nbSeats;
    /**
     * @var integer
     */
    private $nbWheels;

    /*AVANCER*/
    public function forward()
    {
        $this->currentSpeed = 15;

        return "Go !";
    }

    /*freiner*/
    public function brake(): string
    {
        $sentence = "";
        while ($this->currentSpeed > 0) {
            $this->currentSpeed--;
            $sentence .= "Brake !!!";
        }
        $sentence .= "I'm stopped !";
        return $sentence;
    }

    /**
     * @return string
     */
    public function getColor(): string
    {
        return $this->color;
    }

    /**
     * @param string $color
     */
    public function setColor(string $color): void
    {
        $this->color = $color;
    }

    /**
     * @return int
     */
    public function getCurrentSpeed(): int
    {
        return $this->currentSpeed;
    }


    /**
     * @param int $currentSpeed
     * @return void
     */
    public function setCurrentSpeed(int $currentSpeed): void
    {
        if ($currentSpeed >= 0) {
            $this->currentSpeed = $currentSpeed;
        }

    }

    public function __construct(string $color)
    {
        $this->color = $color;
    }


}

car.php

<?php

class Car
{

    /**
     * Le nom de roue
     * @var Integer
     */
    private $nbWheels;

    /**
     * La vitesse courante
     * @var Integer
     */
    private $currentSpeed;

    /**
     * La couleur
     * @var String
     */
    private $color;

    /**
     * Le nombre de siege
     * @var Integer
     */
    private $nbSeats;

    /**
     * L'énergie utilisée
     * @var String
     */
    private $energy;

    /**
     * Le niveau de carburant/énergie actuel
     * @var Integer
     */
    private $energyLevel;

    /**
     * @return INT
     */
    public function __construct(string $color, int $nbSeats, string $energy)
    {
        $this->color = $color;
        $this->nbSeats = $nbSeats;
        $this->energy = $energy;
    }

    /*AVANCER*/
    public function forward()
    {
        $this->currentSpeed = 15;

        return "Go !";
    }

    /*freiner*/
    public function brake(): string
    {
        $sentence = "";
        while ($this->currentSpeed > 0) {
            $this->currentSpeed--;
            $sentence .= "Brake !!!";
        }
        $sentence .= "I'm stopped !";
        return $sentence;
    }

    /*DEMARRER*/
    public function start()
    {
        return "start !";
    }

    /**
     * @param String $nbWheel
     * @return int
     */
    public function getNbWheels(): INT
    {
        return $this->nbWheels;
    }

    public function setNbWheels(INT $nbWheel): Car
    {
        $this->nbWheels = $nbWheel;
        return $this;
    }


    /**
     * @return int
     */
    public function getCurrentSpeed(): int
    {
        return $this->currentSpeed;
    }

    /**
     * @param int $currentSpeed
     * @return void
     */
    public function setCurrentSpeed(int $currentSpeed): void
    {
        if ($currentSpeed >= 0) {
            $this->currentSpeed = $currentSpeed;
        }

    }


    /**
     * @return string
     */
    public function getColor(): string
    {
        return $this->color;
    }

    /**
     * @param string $color
     */
    public function setColor(string $color): void
    {
        $this->color = $color;
    }


    /**
     * @param String $nbSeats
     * @return int
     */
    public function getNbSeats(): INT
    {
        return $this->nbSeats;
    }

    public function setNbSeats(INT $nbSeats): Car
    {
        $this->nbSeats = $nbSeats;
        return $this;
    }

    /**
     * @return string
     */
    public function getEnergy(): string
    {
        return $this->energy;
    }

    /**
     * @param string $energy
     */
    public function setEnergy(string $energy): string
    {
        $this->energy = $energy;
        return $this;
    }

    /**
     * @param String $eneryLevel
     * @return int
     */
    public function getEnergyLevel(): INT
    {
        return $this->energyLevel;
    }

    public function setEnergyLevel(INT $energyLevel): Car
    {
        $this->energyLevel = $energyLevel;
        return $this;
    }


}

index.php

<?php

require_once 'Bicycle.php';
require_once 'car.php';

// Instanciation d'un nouvel objet $bike
$bike = new Bicycle('blue');
$bike->setCurrentSpeed(20);



// Instanciation d'un nouvel objet $rockrider
$rockrider = new Bicycle('yellow');



// Instanciation d'un nouvel objet $tornado
$tornado = new Bicycle('black');


// Instanciation d'un nouvel objet $K2000
$K2000 = new Car('black',2,'gazol');
$K2000->setNbWheels(4);
$K2000->setCurrentSpeed(5);


// Instanciation d'un nouvel objet $carz
$carz = new Car('red',2,'essence');
$carz->setNbWheels(4);


var_dump($bike);
var_dump($rockrider);
var_dump($tornado);
var_dump($K2000);
var_dump($carz);
echo $K2000->start();
echo $bike->forward();
echo $K2000->brake();