Error shown even if directory already exists

Question

I am making a intranet customer manager in PHP. For each customer a directory is created for the shop to add files into. What my script is supposed do is if no directory exists create it, if it does exists dont create it. What is actually happening is if the directory already exists I am getting the following error :

Warning: mkdir() [function.mkdir]: File exists in     C:\server2go\server2go\htdocs\customermgr\administrator\components\com_chronoforms\form_actions\custo    m_code\custom_code.php(18) : eval()'d code on line 14

So what is happening it is trying to create it anyway, even though the if statement should stop it ?, im confused on what I am doing wrong :-S .

    <?php
    $customerID = $_GET['cfid'];
    $directory = "/customer-files/$customerID";

    if(file_exists($directory) && is_dir($directory)) { 
    }
    else {


    $thisdir = getcwd(); 


    mkdir($thisdir ."/customer-files/$customerID" , 0777); }

    ?>

Answer 1

Replace:

if(file_exists($directory) && is_dir($directory)) {

with:

$thisdir = getcwd();
if(file_exists($thisdir.$directory) && is_dir($thisdir.$directory)) {

or better:

   <?php
    $customerID = $_GET['cfid'];
    $directory = "./customer-files/$customerID";

    if(file_exists($directory) && is_dir($directory)) { 
    }
    else {


    mkdir($directory , 0777); }

    ?>