mkdir function, doesn't appear to be working - php

Question

I have created a mkdir function in my php webpage but it doesn't appear to be working.
Here it is:
mkdir("Game/" . $user . "/" . $name . ".actibuild", 0777, true);
user and name are defined above. Here's the snippet of code:
if (isset($_POST['name'])){
if (isset($_POST['desc'])){
$name = mysql_real_escape_string($_POST['name']);
$desc = mysql_real_escape_string($_POST['desc']);
$user = $check_user['Username'];
mkdir("Game/" . $user . "/" . $name . ".actibuild", 0777, true);
mysql_query("INSERT INTO `games`(`creator`, `name`, `desc`) VALUES ('$user', '$name', '$desc')");
header('Location: Games.php');
}
}
It is correctly running those queries into the database, but it isn't creating those directories.
Can you help?

Answer 1

check the current directory with:
echo __FILE__;
or
echo getcwd();
and build your path relative to this reference.
or
you can use chdir("/") to set the root directory as the current directory, then try to create your path.

Answer 2

Do you know where PHP executes? You have a relative system path (starting with Game). Chances are, your directory is getting created (if permissions allow), but in a location relative to the working directory, which is not necessarily the same place where your PHP script lives.

Answer 3

You using relative paths, it may be not the place you think directories are created but current directory/web-root/etc.
Try:
$path = "Game/" . $user . "/" . $name . ".actibuild";
is_writable('.') || die(realpath('.') . ' is not writable');
mkdir($path, 0777, true) || die(realpath($path).' directory not created');
print_r(realpath($path));