Merge pull request stackery#12 from aiir/fix-PHP_SELF-value

Fix value of `PHP_SELF` when router script is in a subdirectory

Author: txase

bootstrap

@@ -17,8 +17,11 @@ function start_webserver() {
     case 0:
       // exec the command
       $HANDLER = getenv('_HANDLER');
-      chdir('/var/task');
-      exec("PHP_INI_SCAN_DIR=/opt/etc/php-7.1.d/:/var/task/php-7.1.d/ php -S localhost:8000 -c /var/task/php.ini -d extension_dir=/opt/lib/php/7.1/modules '$HANDLER'");
+      $handler_components = explode('/', $HANDLER);
+      $handler_filename = array_pop($handler_components);
+      $handler_path = implode('/', array_merge(['/var/task'], $handler_components));
+      chdir($handler_path);
+      exec("PHP_INI_SCAN_DIR=/opt/etc/php-7.1.d/:/var/task/php-7.1.d/ php -S localhost:8000 -c /var/task/php.ini -d extension_dir=/opt/lib/php/7.1/modules '$handler_filename'");
       exit;
 
     // return the child pid to parent