deny access to certain folder using php

Is it possible to "deny from all" apache htaccess style using php.

I can't use htaccess because im using different webserver, so i wan't to use php to workaround it.

So let say user are trying to access folder name 'david', a开发者_运维技巧ll content and subdirectory are denied from viewing.

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No
PHP cannot be used to protect folders.
Because it is not PHP who serves requests, but a web server

You can move this catalog above Document Root to prevent web access to it.

But premissions will help you nothing

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Use chmod to change the permissions on that directory. Note that the user running PHP needs to own it in that case.

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If you just want to prevent indexing the folder, you can create an index.php file that does a simple redirection. Note: Requests that have a valid filename will still be let through.

<?php
   header("Location: /"); // redirect user to root directory

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Without cooperation from the webserver the only way to protect your files is

• to encrypt them, in an archive, maybe, of which your script would know the password and tell no one - that will end up wasting cpu as the server will be decrypting it all the time, or

• to use an incredibly deranged file naming scheme, a file naming scheme you won't ever describe to anyone, and that only your php script can sort trough.

Still data could be downloaded, bandwidth go to waste and encrypted files decrypted.

It all depends on how much that data matters. And how much your time costs, as these convoluted layers of somewhat penetrable obfuscation will likely eat huge chunks of developer time.

Now, as I said... that would be without cooperation from the webserver... but what if the webserver is cooperating and doesn't know?

I've seen some apache webservers, (can anyone confirm it's in the standard distribution?) for instance, come preloaded with a rule denying access to files starting with .ht, not only .htaccess but everything similar: .htproxy, .htcache, .htwhatever_comes_to_mind, .htyourmama...
Chances are your server could be one of those.

If that's the case... rename your hidden files .hthidden-<filename1>,.hthidden-<filename2>... and you'll get access to them only through php file functions, like readfile()