better-example.php

<?php

interface iPropulsion
{
    public function accelerate();
    public function decelerate();
}

interface iOrdonance
{
    public function lockOn();
    public function fire();
}

class CarEngine implements iPropulsion
{
    public function accelerate()
    {
        return "increase revs to 3000... This should shake yer kidney stones...";
    }

    public function decelerate()
    {
        return "decrease revs to 1000";
    }
}

class JetEngine implements iPropulsion
{
    public function accelerate()
    {
        return "increase revs to 20000... To the ends of skies...";
    }

    public function decelerate()
    {
        return "decrease revs to 5000";
    }
}

class Cannon implements iOrdonance
{
    public function lockOn()
    {
        return "Srsly?! Just point and shoot, how hard is that...";
    }

    public function Fire()
    {
        return "Dagagagagaga!";
    }
}

class Rocket implements iOrdonance
{
    public function lockOn()
    {
        return "Beep... Beep... Beeeeeeeeeeeep...";
    }

    public function Fire()
    {
        return "Swhooosh! Ka-Boom!";
    }
}

class Vehicle {
    private $propulsion = null;
    private $ordonance = null;

    public function __construct(iPropulsion $propulsion, iOrdonance $ordonance)
    {
        $this->propulsion = $propulsion;
        $this->ordonance = $ordonance;
    }

    public function start()
    {
        print $this->propulsion->accelerate() . PHP_EOL;
    }

    public function stop()
    {
        print $this->propulsion->decelerate() . PHP_EOL;
    }

    public function lockOn()
    {
        print $this->ordonance->lockOn() . PHP_EOL;
    }

    public function fire()
    {
        print $this->ordonance->fire() . PHP_EOL;
    }

    public function setPropulsion(iPropulsion $propulsion)
    {
        $this->propulsion = $propulsion;
    }

    public function setOrdonance(iOrdonance $ordonance)
    {
        $this->ordonance = $ordonance;
    }
}

print "Hey I want a new fighting vehicle... With a Cannon!" . PHP_EOL;
$fighter = new Vehicle(new CarEngine(), new Cannon());

print "Peel off" . PHP_EOL;
$fighter->start();

print "Hey I want some target practice :)" . PHP_EOL;
print "Going to lock on the target" . PHP_EOL;
$fighter->lockOn();

print "Time to blow stuff up" . PHP_EOL;
$fighter->fire();

print "This sux, moving too slow :(" . PHP_EOL;
$fighter->stop();

print "I need a better engine, mekkaniku-san, and rockets, lotsalotsa rockets, kthxbai" . PHP_EOL;
$fighter->setPropulsion(new JetEngine());
$fighter->setOrdonance(new Rocket());

print "Once again into the fray" . PHP_EOL;
$fighter->start();

print "Going to lock on the target, hopefully this will go better than last time" . PHP_EOL;
$fighter->lockOn();

print "Yeeehaw" . PHP_EOL;
$fighter->fire();
print "Control, one bogey down" . PHP_EOL;