Rename folder in PHP

Sometimes, for any reason, we need to rename folder's name in PHP (like I do for system folder in EE.).

There is a function in php called <a href="http://php.net/manual/en/function.rename.php">rename</a>. This function works perfectly with files.

The problems (in my case) begin with folder's rename, when I want to do it, I'm using :

rename("myoldfolder","mynewfolder");

Now,when I'm using this, I have the next error :

Warning: rename(/myoldfolder,/mynewfolder) [function.rename]: Permission denied in /Applications/MAMP/htdocs/config_dev/configure.php on line 26

This is not a real permission problem around here because I have the right to do it.

But, how ?

The idea is to give an absolute link and not a relative link like this :

rename(realpath(dirname(__FILE__)).'/myoldfolder',realpath(dirname(__FILE__)).'/mynewfolder');

And, voila ! Everything should works perfectly (like in my place) !

realpath(dirname(__FILE__))

This piece of code is going to give your current folder where the code is executed like this :

/Applications/MAMP/htdocs/current_folder/mynewfolder

Hope it helps some of you !

Simon