Drush Alias File for PROJECT.dev Folder Names within multisites

local.aliases.drushrc.php

<?php
$all = $platforms = array();

// Use standard linux 'PATH' style, so if you need more entries separate them using a column ':' char
// For example: '/path/to/platforms/container' OR '/path/to/platforms/container:/path/to/another/location'
// This dorectory will contain one or more drupal roots directories
$platforms_path = '/var/www/platforms';

$paths = explode(':', $platforms_path);
foreach($paths as $path) {
  $drupal_root = new DirectoryIterator($path);
  while ($drupal_root->valid()) {
    // Skip symlinked platforms and dir w/out s sites in it.
    if ( !$drupal_root->isLink() && is_dir($drupal_root->getPathname() . '/sites') ) {
      $platforms[] = $drupal_root->getPathname();
    }
    $drupal_root->next();
  }
}

foreach($platforms as $drupal) {
  $site = new DirectoryIterator($drupal . '/sites');
  while ($site->valid()) {
    // Look for directories containing a 'settings.php' file
    if ( $site->isDir() && !$site->isDot() ) {
      // Skip the "default" site directory anche check if settings.php does exist
      if ( $site->getBasename() != 'default' && file_exists($site->getPathname() . '/settings.php')) {
        // Add site alias
        $basename = $aliasname = $site->getBasename();

        // If the site contains already `local.` as prefix, just discard it
        $matches = [];
        if( preg_match('/^local\.(.+)/i', $basename, $matches) ){
          $aliasname = $matches[1];
        }

        $aliases[$aliasname] = array(
          'uri' => $basename,
          'root' => $drupal,
        );
      }
    }
    $site->next();
  }
}

// Get all site aliases
foreach ($aliases as $name => $definition) {
  $all[] = '@' . $name;
}

// 'All' alias group
$aliases['all'] = array(
  'site-list' => $all,
);