Log: when PHP cli-server is running, log on console

src/Log.php

@@ -198,10 +198,10 @@ class Log {
       $msg[] = $message;
       $msg = implode(' - ', $msg)."\n";
     }
-    if (self :: $file_fd)
+    if (!self :: $file_fd || php_sapi_name() == 'cli-server')
+      error_log(rtrim($msg, "\n"));
+    else
       fwrite(self :: $file_fd, $msg);
-    elseif (self :: $error_log_fallback)
-      error_log($msg);
 
     if ($level == 'FATAL')
       if (!is_null(self :: $fatal_error_handler))