OtLand PageView

<?php

    namespace OtLand;

    class PageView {
        protected static $cookie = 'otland_pageview';
        private static $read   = array(),
                       $unread = array();


        /**
         * Returns the predefined cookie variable.
         *
         * @access protected
         * @static true
         * @throws Exception
         * @return string
        **/
        protected static function getCookie() {
            if (!isset($_COOKIE[self::$cookie])) {
                if (empty(self::$read)) {
                    self::setCookie(' ', false);
                } else {
                    self::markAsRead(array());
                }
            }

            return $_COOKIE[self::$cookie];
        }


        /**
         * Sets the value of a predefined cookie variable.
         *
         * @param  mixed   $value
         * @param  boolean $extend true
         * @access protected
         * @return void
        **/
        protected static function setCookie($value, $extend = true) {
            \setcookie(self::$cookie, ($extend && self::getCookie() != ' ' ? self::getCookie() . PATH_SEPARATOR : null) . $value);
        }


        /**
         * Returns true in case a post/page id has already been discovered.
         *
         * @param  integer $id
         * @access public
         * @static true
         * @return boolean
        **/
        public static function isRead($id) {
            if (!preg_match('/' . PATH_SEPARATOR . '?' . $id . PATH_SEPARATOR . '?/', self::getCookie())) {
                return false;
            }

            return true;
        }


        /**
         * Returns true in case a post/page id has yet to be discovered.
         *
         * @param  integer $id
         * @access public
         * @static true
         * @return boolean
        **/
        public static function isUnread($id) {
            return !self::isRead($id);
        }


        /**
         * Marks a specific post/page id as read.
         *
         * @param  integer $id
         * @access public
         * @static true
         * @return boolean
        **/
        public static function markAsRead($ids) {
            $ids = (array) $ids;

            foreach ($ids as $id) {
                if (self::isRead($id)) {
                    continue;
                }

                // Workaround for setting cookies once per request.
                self::$read[] = $id;
            }

            if (!empty(self::$read)) {
                self::setCookie(implode(PATH_SEPARATOR, self::$read));
            }
        }


        /**
         * Marks a specific post/page id as unread.
         *
         * @param  integer $id
         * @access public
         * @static true
         * @return boolean
        **/
        public static function markAsUnread($ids) {
            $ids = (array) $ids;

            foreach ($ids as $id) {
                if (self::isUnread($id)) {
                    continue;
                }

                // Workaround for setting cookies once per request.
                self::$unread[] = $id;
            }

            if (!empty(self::$unread)) {
                $storage = preg_replace('/' . PATH_SEPARATOR . '?(' . implode('|', self::$unread) . ')' . PATH_SEPARATOR . '?/', PATH_SEPARATOR, self::getCookie());
                $storage = trim($storage, PATH_SEPARATOR);

                self::setCookie($storage, false);
            }
        }


        /**
         * Returns an array of post/page ids.
         *
         * @param  boolean $sort true
         * @access public
         * @static true
         * @return array
        **/
        public static function getAll($sort = true) {
            $tmp = explode(PATH_SEPARATOR, self::getCookie());

            // Remove the empty default value from the array.
            if (array_search(' ', $tmp) !== false) {
                unset($tmp[array_search(' ', $tmp)]);
            }

            // Convert all values into integer values.
            $tmp = (array) array_map('intval', $tmp);

            if ($sort) sort($tmp);

            return $tmp;
        }


        /**
         * Resets the storage cookie.
         *
         * @access public
         * @static true
         * @return void
        **/
        public static function reset() {
            setcookie(self::$cookie, '', time() - 3600);
        }
    }