<?php
	class Vehicle
	{
		function __construct($data=null)
		{
			$this->tankSize = ($data['tankSize']) ? $data['tankSize'] : 50;	// Default tank size of 50L
			$this->engineSize = ($data['engineSize']) ? $data['engineSize'] : 1.6;	// Default engine size of 1.6L
			$this->exteriorColor = ($data['exteriorColor']) ? $data['exteriorColor'] : 'unpainted';	// Default colour of "unpainted"
			$this->odometer = 0;	// Every new car starts with zero km on the clock
 
			echo "(".__FUNCTION__.") We just made a new ".$this->exteriorColor." car that has a ".$this->tankSize."L tank and a ".$this->engineSize." engine.\n";
		}
 
		function __destruct()
		{
			echo "(".__FUNCTION__.") This car object is being destroyed and there is ".$this->fuelRemaining."L of fuel left.\n";
			echo "(".__FUNCTION__.") It has also traveled ".$this->odometer."km.  Not bad for a ".$this->exteriorColor." car!\n";
		}
 
		function driveDistance($distance,$speed)
		{
			// Rough formula that means going 50km at 80km/hr w/ a 1.6L car uses 6.4L ...
			$fuelRequired = $distance * $speed * $this->engineSize / 1000;
			// echo "  We are about to drive ".$distance."km at ".$speed."km/hr - that requires ".$fuelRequired."L of fuel\n";
			if ($fuelRequired > $this->fuelRemaining)
			{
				echo "(".__FUNCTION__.") Not enough fuel to go ".$distance."km at ".$speed."km/hr\n";
				return false;
			}
			$this->fuelRemaining -= $fuelRequired;
			$this->odometer += $distance;
			return true;
		}
 
		function refillTank()
		{
			echo "(".__FUNCTION__.") The fuel tank is currently ".ceil(($this->fuelRemaining/$this->tankSize)*100)."% full - we will refill it.\n";
			$this->fuelRemaining = $this->tankSize;
			echo "(".__FUNCTION__.") The fuel tank is now ".ceil(($this->fuelRemaining/$this->tankSize)*100)."% full\n";
		}
	}
 
	// ---- Main Program ----
 
	$car = new Vehicle(array(
		'engineSize'=>1.6,
		'tankSize'=>35,
		'exteriorColor'=>'red'
	));
 
	$car->refillTank();
 
	// Drive this car in 1km chunks until the tank runs dry.
	echo "Let's drive this car until we run out of fuel!\n";
	while ($car->driveDistance(1,50))
		echo '.';
 
	echo "\nThe car was able to drive ".$car->odometer."km before it could go no further.\n";	
 
	// End of script - the car object will be destroyed
?>