Added static page

code/static.php

@@ -0,0 +1,70 @@
+<?php
+
+// When writing a class, all of the properties and methods are being defined for the object
+// that will be created from the class.
+
+class House
+{
+    public $color;
+
+    public function __construct($color)
+    {
+        $this->color = $color;
+    }
+}
+
+// Like building a house, a class is a blueprint that
+// defines what the house can do and the object is the house itself that can actually
+// perform the actions defined in the blueprint.
+$house = new House('Green');
+
+// However, what if you want the blueprint to have properties and methods?
+// That is when you use the "static" keyword. In this class, we will define a default color
+// on the class itself and then use it when creating a new object.
+class Skyscraper
+{
+    private static $popularColor;
+    public $color;
+
+    public static function setDefaultColor($color)
+    {
+        self::$popularColor = $color;
+    }
+
+    public function __construct()
+    {
+        $this->color = self::$popularColor;
+    }
+}
+
+// You can access static methods and properties using double colons on "self" inside the object
+// or on the class name outside of the object. Static methods and properties can only access
+// other static methods and properties.
+Skyscraper::setDefaultColor('Grey');
+$skyscraper = new Skyscraper();
+echo $skyscraper->color . "\n";
+
+// Often, you will see static constructors in PHP.
+// A static constructor creates a new instance of an object. Why would do that when you just use "new Class" to create
+// a new object? The most common reason is to make the code more readable.
+class TinyHouse
+{
+    private $color;
+    private $wheels;
+    private $trailer;
+
+    public static function build($color, $wheels, $trailer)
+    {
+        return new self($color, $wheels, $trailer);
+    }
+
+    public function __construct($color, $wheels, $trailer)
+    {
+        $this->color = $color;
+        $this->wheels = $wheels;
+        $this->trailer = $trailer;
+    }
+}
+
+// Using "build" can make more sense than "new", but it is ultimately a personal choice.
+$house = TinyHouse::build('Blue', 4, true);