php rename錯(cuò)誤原因的查找方法

if (!rename($file->filepath, $full_path)) {
  $error = error_get_last();
  watchdog('name', "Failed to move the uploaded file from %source to   %dest", array('%source' => $file->filepath, '%dest' => $full_path));
}

if (file_exists($old_name) 
    ((!file_exists($new_name)) || is_writable($new_name))) {
    rename($old_name, $new_name);
}

error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);