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(PHP 4 >= 4.3.2, PHP 5)
streamWrapper::dir_opendir — Open directory handle
$path 
   ,  int $options 
   )This method is called in response to opendir() .
path Specifies the URL that was passed to opendir() .
Note:
The URL can be broken apart with parse_url() .
options Whether or not to enforce safe_mode (0x04).
   成功时返回  TRUE , 或者在失败时返回  FALSE 。