我的代码：$file_handle = fopen("/data/webroot/resource/php/f.txt","r");

右边的错误提醒

Warning: fopen(): Unable to access /resource/php/f.txt in /754/4wIN/index.php on line 3

Warning: fopen(/resource/php/f.txt): failed to open stream: Permission denied in /754/4wIN/index.php on line 3

Warning: fclose() expects parameter 1 to be resource, boolean given in /754/4wIN/index.php on line 12