file_exists（）不起作用。文件上传

Question

在这里寻求帮助。

由于某种原因，file_exists（）对我不起作用。

始终上传文件并替换旧文件。它应该显示消息文件已经存在。

思想？

由于 大道

if (!empty($_GET['action'])&& $_GET['action']=='save'){
      $path = "../uploads/";
      $path = $path . basename( $_FILES['uploaded_file']['name']);
      $uploadOK = 1;

      if (file_exists($path)) {
          $message = array("type" => "info", "message" => "file already exists.");
          $uploadOk = 0;
      }

      if ($uploadOk = 1) {
        if(move_uploaded_file($_FILES['uploaded_file']['tmp_name'], $path)) {
          $message = array("type" => "info", "message" => "File has been uploaded.");

        } else{
          $message = array("type" => "info", "message" => "Error please try again.");
        }
      }

}