detecting folder if exist and create folder

[jannoy]

to all guru

how would i detect if a folder is existing or not??
and also how to create new folder

thanks in advance

[LordShryku]

[man]file_exists[/man] or [man]is_dir[/man]
[man]mkdir[/man]

[Kudose]

$dir = "/home/XXX/public_html/XXX/";
if (!file_exists($dir)){ mkdir($dir, 0755); }