Issue #2206263 by sun: Drupal_is_cli() returns FALSE on PHP CLI.

core/includes/bootstrap.inc

@@ -2461,7 +2461,7 @@ function drupal_static_reset($name = NULL) {
  * Detects whether the current script is running in a command-line environment.
  */
 function drupal_is_cli() {
-  return (!isset($_SERVER['SERVER_SOFTWARE']) && (php_sapi_name() == 'cli' || (is_numeric($_SERVER['argc']) && $_SERVER['argc'] > 0)));
+  return PHP_SAPI === 'cli';
 }
 
 /**