Issue #1543858 by danquah, pp, alexpott, dawehner, cilefen, jmolivas, esod,...

Issue #1543858 by danquah, pp, alexpott, dawehner, cilefen, jmolivas, esod, jhedstrom, andypost, kenorb, bserem: Add a startup configuration for the built-in PHP server that supports clean URLs

.ht.router.php

+<?php
+
+/**
+ * @file
+ * Router script for the built-in PHP web server.
+ *
+ * The built-in web server should only be used for development and testing as it
+ * has a number of limitations that makes running Drupal on it highly insecure
+ * and somewhat limited.
+ *
+ * Note that:
+ * - The server is single-threaded, any requests made during the execution of
+ *   the main request will hang until the main request has been completed.
+ * - The web server does not enforce any of the settings in .htaccess in
+ *   particular a remote user will be able to download files that normally would
+ *   be protected from direct access such as .module files.
+ *
+ * The router script is needed to work around a bug in PHP, see
+ * https://bugs.php.net/bug.php?id=61286.
+ *
+ * Usage:
+ * php -S localhost:8888 .ht.router.php
+ *
+ * @see http://php.net/manual/en/features.commandline.webserver.php
+ */
+
+$url = parse_url($_SERVER['REQUEST_URI']);
+if (file_exists('.' . $url['path'])) {
+  // Serve the requested resource as-is.
+  return FALSE;
+}
+
+// The use of a router script means that a number of $_SERVER variables have to
+// be updated to point to the index-file.
+$index_file_absolute = $_SERVER['DOCUMENT_ROOT'] . DIRECTORY_SEPARATOR . 'index.php';
+$index_file_relative = DIRECTORY_SEPARATOR . 'index.php';
+
+// SCRIPT_FILENAME will point to the router script itself, it should point to
+// the full path of index.php.
+$_SERVER['SCRIPT_FILENAME'] = $index_file_absolute;
+
+// SCRIPT_NAME and PHP_SELF will either point to index.php or contain the full
+// virtual path being requested depending on the URL being requested. They
+// should always point to index.php relative to document root.
+$_SERVER['SCRIPT_NAME'] = $index_file_relative;
+$_SERVER['PHP_SELF'] = $index_file_relative;
+
+// Require the main index.php and let core take over.
+require $index_file_absolute;