Post Sharing for Programmers original class before plugin creation

sharing-links.php

<?php
/**
 * A class to enable easier generation of sharing links per service, rather than
 * having to hard-code them in templates
**/
    global $sharing_links;

    class Sharing_Links {
        private $title;
        private $link;
        private $services = array();

        public function __construct() {
            $this->addService('email',         'mailto:?subject={title}&body={permalink}');
            $this->addService('facebook',     'https://www.facebook.com/sharer/sharer.php?u={permalink}');
            $this->addService('twitter',     'https://twitter.com/home?status={title} {permalink}');
            $this->addService('plus',         'https://plus.google.com/share?url={permalink}');
            $this->addService('linkedin',     'https://www.linkedin.com/shareArticle?mini=true&url={permalink}&title={title}');
        }

        public function setTitle($title) {
            $this->title = $title;
            return $this;
        }

        public function setLink($link) {
            $this->link = $link;
            return $this;
        }

        public function addService($name, $url) {
            $this->services[$name] = $url;
        }

        public function getService($name) {
            return isset($this->services[$name]) ? $this->applyReplacement($this->services[$name]) : null;
        }

        public function getNonService($url, $name = '', $add = false) {
            if (true === $add && $name != '') {
                $this->addService($name, $url);
                $service = $this->applyReplacement($this->services[$name]);
            } else {
                $service = $this->applyReplacement($url);
            }

            return $service;
        }

        public function getServices() {
            $services = $this->services;

            foreach ($services as &$service) {
                $service = $this->applyReplacement($service);
            }

            return (object) $services;
        }

        private function applyReplacement($url) {
            return str_replace(array('{title}', '{permalink}'), array($this->title, $this->link), $url);
        }
    }

    $sharing_links = new Sharing_Links();