Baruch PHP & MySQL Course

README.md

Baruch's PHP and MySQL Class Example Code

Due to a popular demand for object-oriented PHP, here are the examples that I covered in class.

Files included:

• vehicle.php - a generic class that has properties and methods that any "vehicle" can extend
• car.php - a car class that extends vehicle
• test.php - requires vehicle.php and car.php and extends a series of statements with comments that represents what should be outputted

Credits:

Written by Will Chan
Homepage: http://www.chanify.com
Original Source: https://github.com/wchan2/baruch_php_examples

car.php

<?php

/**
 * Car - inherits from the vehicle class
 * @package default
 * @author William Chan
 */
class Car extends Vehicle { 
	protected $brand; 
	protected $gallons_of_gas;
	
	// Constructor to create the car object
	public function __construct($num_wheels = 4, $speed = 0, $init_gas = 0, $brand = 'Honda') {
		parent::__construct($num_wheels, $speed);
		$this->brand = $brand;
		$this->gallons_of_gas = $init_gas;
	}
	
	// Adds the specified number of gallons of gas
	public function add_gas($gallons_to_add) {
		$this->gallons_of_gas += $gallons_to_add;
	}
	
	// Drive - for each hour I drive I lose 10 gallons of gas
	public function drive($hours_drove) {
		$this->gallons_of_gas -= 10 * $hours_drove;
		if ($this->gallons_of_gas < 0) {
			$this->gallons_of_gas = 0;
			print $this->breakdown();
		}
	}
	
	// Gets the remaining gas left
	public function gas_left() {
		return $this->gallons_of_gas;
	}
	
	// Returns the brand of the car
	public function get_brand() {
		return $this->brand;
	}
	
	// Trade in your car
	public function trade_in_for($brand = 'BMW') {
		$this->brand = $brand;
	}
	
	// Returns the statement that the car has broken down
 	private function breakdown() {
		return "My car broke! :( :(";
	}
}

?>

test.php

<?php

require_once 'vehicle.php';
require_once 'car.php';

/**
 * Test code for Vehicle
 */
$wills_vehicle = new Vehicle(2, 20);
print "Will's vehicle has ".$wills_vehicle->get_speed()." horsepower.\n\n"; // Will's vehicle has 20 horsepower.
print "Will's vehicle has ".$wills_vehicle->get_num_wheels()." wheels.\n\n"; // Will's vehicle has 4 wheels.

/**
 * Test code for Car
 */
print "Will's going to get a car now!\n\n";
$wills_car = new Car(4, 100, 10, 'Toyota'); 
print "Will's car is a ".$wills_car->get_brand().".\n\n"; // Will's car is a Toyota
print "Will's car has ".$wills_car->gas_left()." gallons of gas left.\n\n"; // Will's car has 10 gallons of gas left.
print "Adding 100 gallons of gas...\n\n";
$wills_car->add_gas(100); 
print "How many gallons of gas does Will's car have now?\t\t".$wills_car->gas_left(); // 110
$wills_car->drive(5); // 110 - (5 * 60)
print "\n\nWhat about now?\t\t".$wills_car->gas_left()."\n\n";

// Driving too much...
$wills_car->drive(100); // My car broke! :( :( 
print "\n\nOh well. Time to trade it in for a new one!\n\n";
$wills_car->trade_in_for("Porsche");
print $wills_car->get_brand()." goes VROOM!!!";

?>

vehicle.php

<?php

/**
 * Vehicle 
 *
 * @package default
 * @author William Chan
 */
class Vehicle {
	// Properties of the vehicle object
	protected $num_wheels;
	protected $speed;

	// Constructor to create the vehicle object
	public function __construct($num_wheels = 0, $speed = 0) {
		$this->num_wheels = $num_wheels;
		$this->speed = $speed;
	}
	
	// Returns the speed of the vehicle
	public function get_speed() {
		return $this->speed;
	}
	
	// Returns the number of wheels on the vehicle
	public function get_num_wheels() {
		return $this->num_wheels;
	}
}

?>