.ht.router.php causes a redirect loop when invoked from parent directory

Problem/Motivation

The current version of .ht.router.php does not work in conjunction with drupal-project. The script causes an redirect loop if it invoked from the project root.

php -S localhost:8888 -t web web/.ht.router.php

The root cause it the different cwd. getcwd() returns the project root and not the Drupal root.

Proposed resolution

Add chdir at the beginning of the script, or replace file_exists('.' . $url['path']) with file_exists(__DIR__ . $url['path'])

Remaining tasks

User interface changes

API changes

Data model changes