Added MultiInherit using Traits.

Author: JREAM

README.md

@@ -19,7 +19,7 @@ More will come later on.
 - iterator - Access elements of an aggregate object without knowing whats under
   the hood.
 - **memento** - No encapsulation, allows you to change an objects internal state
-  and restore it.
+- **multi_inherit** - Extend a base class and act as if we can extend other classes for added functionality
 - **observer** - (aka Publish/Subscribe) One to Many Dependency to notify that
   an object has changed.
 - **prototype** - Create new object by cloning from a skeleton of an object.

multi_inherit/MultiInherit.php

@@ -0,0 +1,92 @@
+<?php
+/**
+ * Multi Inheritance
+ *
+ * @desc
+ *     In some languages you can extend multiple classes, for example python:
+ *         class User(Address, Profile):
+ *
+ *     In PHP we accomplish this with Traits, they are very convenient.
+ *     These were introduced in 5.4.
+ *
+ * @usage
+ *
+ *     Give any class re-usable functionality by typing it once.
+ *
+ * @example
+ *     We will have a User class that extends a fake Model
+ *     We want the User to inherit features from: Profile, TimeInfo
+ *     We will use Traits
+ *
+ */
+require_once '../constants.php'; // For NEWLINE output
+
+// --------------------------------------------------------
+// One way of doing this is by faking it
+//      Note: This isn't considered bad, it's a pattern that
+//            actually separates dependencies and can be used
+//            for many things other than this.
+// --------------------------------------------------------
+
+class BasicModel {};    // Our main item to Extend
+class BasicProfile {};  // A utility class
+class BasicTimeInfo {}; // A utility class
+
+// You'd do something like this
+class BasicUser extends BasicModel {
+    public function __construct() {
+        $this->profile = new BasicProfile();
+        $this->dateTime = new BasicTimeInfo();
+    }
+}
+
+
+// --------------------------------------------------------
+// A Better way to do it, use Traits (They are Classes)
+// --------------------------------------------------------
+class Model {
+    public $info = 'I something important, I think.';
+};
+
+trait Profile {
+    public function calculateAge($birthday) {
+        // I'm not doing logic :)
+        return 90;
+    }
+}
+
+trait TimeInfo {
+    public function getUTC() {
+        // Not doing logic :)
+        return time();
+    }
+}
+
+class User extends Model {
+    use Profile;
+    use TimeInfo;
+
+    public function hello() {
+        return 'hello';
+    }
+}
+
+// --------------------------------------------------------
+// Example
+// --------------------------------------------------------
+
+$user = new User;
+
+$a = $user->hello();
+echo "From the user Class: $a" . NEWLINE;
+
+$b = $user->info;
+echo "From the model Class: $b" . NEWLINE;
+
+$c = $user->calculateAge('10-25-84');
+echo "From the Profile Trait: $c" . NEWLINE;
+
+$d = $user->getUTC();
+echo "From the TimeInfo Trait: $b" . NEWLINE;
+
+echo NEWLINE;