Core_File::check_and_get_path

protected static function check_and_get_path($file)
{
    if (is_array($file))
    {
        $array_mode = true;
    }
    else
    {
        $array_mode = false;
        $file = (array)$file;
    }

    $data = array();
    foreach (File::$dir as $key=>$path)
    {
        $len = strlen($path);
        foreach ($file as $f)
        {
   	        $s = substr($f,0,$len);
   	        if ($s == $path)
   	        {
   	            if (!$array_mode)
   	            {
   	                # 单文件模式，直接返回
   	                return array($key,substr($f,$len));
   	            }
   	            else
   	            {
   	                # 多文件，加入列表
       	            $data[0][] = $key;
       	            $data[1][] = substr($f,$len);
   	            }
   	        }
        }
    }

    if ($array_mode && $data)return $data;

    throw new Exception(__('Not allowed to operate the corresponding directory'));
}