Intro to PHP classes

classes.php

<?php

// This class defines what a dog is
class Dog {
	// What runs when you make a "new Dog()"
	function __construct($breed, $size) {
		// Doing $this->whatever = $whatever assigns whatever's 
		// in the parenthesis to THAT particular dog
		// that's being defined.
		$this->breed = $breed;
		$this->size = $size;
	}
	
	// What exactly does a bark do?
	public function bark() {
		// If the dog is small, make a small dog noise.
		if($this->size == 'small')
		{
			echo "yip!";
		}
		// If the dog is big, bark like a big dog.
		else if($this->size == 'big')
		{
			echo "WOOF!";
		}
	}
}

// New dog named Rex, who's a pitbull and is big
$rex = new Dog("Pitbull", "big");
// A different dog named fido, who's a poodle and is small
$fido = new Dog("Poodle", "small");

$rex->bark(); // Will echo WOOF!
$fido->bark(); // Will echo yip!