--- /dev/null
+<?php
+/**
+ * Converts an array-represented URL to a string
+ *
+ * Source: http://php.net/manual/en/function.parse-url.php#106731
+ *
+ * @see http://php.net/manual/en/function.parse-url.php
+ *
+ * @param array $parsedUrl an array-represented URL
+ *
+ * @return string the string representation of the URL
+ */
+function unparse_url($parsedUrl)
+{
+ $scheme = isset($parsedUrl['scheme']) ? $parsedUrl['scheme'].'://' : '';
+ $host = isset($parsedUrl['host']) ? $parsedUrl['host'] : '';
+ $port = isset($parsedUrl['port']) ? ':'.$parsedUrl['port'] : '';
+ $user = isset($parsedUrl['user']) ? $parsedUrl['user'] : '';
+ $pass = isset($parsedUrl['pass']) ? ':'.$parsedUrl['pass'] : '';
+ $pass = ($user || $pass) ? "$pass@" : '';
+ $path = isset($parsedUrl['path']) ? $parsedUrl['path'] : '';
+ $query = isset($parsedUrl['query']) ? '?'.$parsedUrl['query'] : '';
+ $fragment = isset($parsedUrl['fragment']) ? '#'.$parsedUrl['fragment'] : '';
+
+ return "$scheme$user$pass$host$port$path$query$fragment";
+}
+
+/**
+ * URL representation and cleanup utilities
+ *
+ * Form
+ * scheme://[username:password@]host[:port][/path][?query][#fragment]
+ *
+ * Examples
+ * http://username:password@hostname:9090/path?arg1=value1&arg2=value2#anchor
+ * https://host.name.tld
+ * https://h2.g2/faq/?vendor=hitchhiker&item=guide&dest=galaxy#answer
+ *
+ * @see http://www.faqs.org/rfcs/rfc3986.html
+ */
+class Url
+{
+ private static $annoyingQueryParams = array(
+ // Facebook
+ 'action_object_map=',
+ 'action_ref_map=',
+ 'action_type_map=',
+ 'fb_',
+ 'fb=',
+
+ // Scoop.it
+ '__scoop',
+
+ // Google Analytics & FeedProxy
+ 'utm_',
+
+ // ATInternet
+ 'xtor='
+ );
+
+ private static $annoyingFragments = array(
+ // ATInternet
+ 'xtor=RSS-',
+
+ // Misc.
+ 'tk.rss_all'
+ );
+
+ /*
+ * URL parts represented as an array
+ *
+ * @see http://php.net/parse_url
+ */
+ protected $parts;
+
+ /**
+ * Parses a string containing a URL
+ *
+ * @param string $url a string containing a URL
+ */
+ public function __construct($url)
+ {
+ $this->parts = parse_url($url);
+ }
+
+ /**
+ * Returns a string representation of this URL
+ */
+ public function __toString()
+ {
+ return unparse_url($this->parts);
+ }
+
+ /**
+ * Removes undesired query parameters
+ */
+ protected function cleanupQuery()
+ {
+ if (! isset($this->parts['query'])) {
+ return;
+ }
+
+ $queryParams = explode('&', $this->parts['query']);
+
+ foreach (self::$annoyingQueryParams as $annoying) {
+ foreach ($queryParams as $param) {
+ if (startsWith($param, $annoying)) {
+ $queryParams = array_diff($queryParams, array($param));
+ continue;
+ }
+ }
+ }
+
+ if (count($queryParams) == 0) {
+ unset($this->parts['query']);
+ return;
+ }
+
+ $this->parts['query'] = implode('&', $queryParams);
+ }
+
+ /**
+ * Removes undesired fragments
+ */
+ protected function cleanupFragment()
+ {
+ if (! isset($this->parts['fragment'])) {
+ return;
+ }
+
+ foreach (self::$annoyingFragments as $annoying) {
+ if (startsWith($this->parts['fragment'], $annoying)) {
+ unset($this->parts['fragment']);
+ break;
+ }
+ }
+ }
+
+ /**
+ * Removes undesired query parameters and fragments
+ *
+ * @return string the string representation of this URL after cleanup
+ */
+ public function cleanup()
+ {
+ $this->cleanupQuery();
+ $this->cleanupFragment();
+ return $this->__toString();
+ }
+}