johnkary · August 29, 2015 14:14 · Feb 7, 2015 · Feb 7, 2015 · Feb 7, 2015
diff --git a/mailer.php b/mailer.php
@@ -33,7 +33,7 @@ public function isLazy() {
 }
 namespace Mailer\Options {
     class Lazy {
-        public function __invoke(Mailer $mailer) {
+        public function __invoke(\Mailer\Mailer $mailer) {
             $mailer->setLazy(true);
         }
     }

diff --git a/mailer.php b/mailer.php
@@ -11,6 +11,7 @@ class Mailer {
         private $host;
         private $lazy = false;
 
+        // ... is variadic function syntax. See: http://php.net/manual/en/functions.arguments.php#functions.variable-arg-list
         public function __construct($host, ...$options) {
             $this->host = $host;
 
@@ -47,19 +48,24 @@ function SuperLazy() {
 namespace {
     use function \Mailer\Options\SuperLazy;
 
+    // Anonymous functions configure Mailer
+    // Wire up as many as needed for optional settings and pass as constructor arguments
     $tls = function (\Mailer\Mailer $mailer) {
         echo 'LOL Lets do some TLS --';
     };
 
 
-    // Any one of these $lazy vars can be passed as an option
+    // Any one of these $lazy vars can be passed as options arguments
+    // 1. Anonymous function
     $lazy1 = function (\Mailer\Mailer $mailer) {
         $mailer->setLazy(true);
     };
+    // 2. Object that responds to being used like a function via __invoke()
     $lazy2 = new \Mailer\Options\Lazy;
-    $lazy3 = SuperLazy(); // Ughhh, I want to do `$lazy3 = SuperLazy;` but PHP won't let me
+    // 3. Namespaced function (must return an anonymous function)
+    $lazy3 = SuperLazy();
 
-    $mailer = new \Mailer\Mailer('www.gmail.com', $tls, $lazy3);
+    $mailer = new \Mailer\Mailer('www.gmail.com', $tls, $lazy3); // Add any function options to your liking
 
     echo $mailer->isLazy() ? 'Yes lazy' : 'No lazy';
 }
diff --git a/mailer.php b/mailer.php
@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * PHP 5.6 example of "Functional Options" as presented by Rob Pike
+ * in his article "Self-referential functions and the design of options"
+ * http://commandcenter.blogspot.com.au/2014/01/self-referential-functions-and-design.html
+ */
+
+namespace Mailer {
+    class Mailer {
+        private $host;
+        private $lazy = false;
+
+        public function __construct($host, ...$options) {
+            $this->host = $host;
+
+            foreach ($options as $option) {
+                $option($this);
+            }
+        }
+
+        // Wish this could be a private function and still be
+        // invoked by an options function so it's not mutable from the outside
+        public function setLazy($lazy) {
+            $this->lazy = $lazy;
+        }
+
+        public function isLazy() {
+            return $this->lazy;
+        }
+    }
+}
+namespace Mailer\Options {
+    class Lazy {
+        public function __invoke(Mailer $mailer) {
+            $mailer->setLazy(true);
+        }
+    }
+
+    function SuperLazy() {
+        return function(\Mailer\Mailer $mailer) {
+            $mailer->setLazy(true);
+        };
+    }
+}
+
+namespace {
+    use function \Mailer\Options\SuperLazy;
+
+    $tls = function (\Mailer\Mailer $mailer) {
+        echo 'LOL Lets do some TLS --';
+    };
+
+
+    // Any one of these $lazy vars can be passed as an option
+    $lazy1 = function (\Mailer\Mailer $mailer) {
+        $mailer->setLazy(true);
+    };
+    $lazy2 = new \Mailer\Options\Lazy;
+    $lazy3 = SuperLazy(); // Ughhh, I want to do `$lazy3 = SuperLazy;` but PHP won't let me
+
+    $mailer = new \Mailer\Mailer('www.gmail.com', $tls, $lazy3);
+
+    echo $mailer->isLazy() ? 'Yes lazy' : 'No lazy';
+}
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