难,要么服务器设置访问权限(但仍能知道路径),要么全部向客户端echo(或者流方式传送)
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sleep
(PHP 3, PHP 4, PHP 5)sleep -- Delay execution
Description
int sleep ( int seconds )The sleep() function delays program execution for the given number of seconds. -----------------------------------------
you can use a php page that links to the file(record the root in your database),add the head and make the file as a file stream.then the client may download the file without getting the root of the file(they will see http://ip/download.php)