Online PHP editor | output for tTreF

<?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'; }