Initial commit for public repo

code/classes.php

@@ -0,0 +1,42 @@
+<?php
+
+// Classes allow you to define your own data types. All classes start with the
+// class keyword followed by the name of the class and opening and closing curly braces.
+class Car
+{
+}
+
+// To create an instance of a class, you use the "new" keyword in front of the class name
+// with parentheses.
+$car = new Car();
+
+// A class can define attributes and methods. An attribute is a piece of data
+// stored on the class instance. You can define an attribute by adding the
+// word "public" and a variable name inside the class definition.
+class Bicycle
+{
+    public $color;
+}
+
+// Then, when you create an instance of the class, you can set and use
+// the color attribute on the bicycle using "->".
+$bike = new Bicycle();
+$bike->color = 'Blue';
+echo $bike->color . "\n";
+
+// A method is a function attached to the class. You can add a method
+// to a class by using the "public" keyword followed by the function. A method
+// can access the attributes and methods of the instance using the "$this" variable.
+class Tricycle
+{
+    public $color;
+
+    public function echoColor()
+    {
+        echo $this->color . "\n";
+    }
+}
+
+$bike = new Tricycle();
+$bike->color = 'Red';
+$bike->echoColor();