PHP Creating a file on the server via controller

I have the following code but it does not seem to be creating a folder at all.

Should I be using is_dir instead of file_exists?

        $location = $_SERVER['DOCUMENT_ROOT'].'/_assets/quote/uploads/';

        $folderName = $this->quote->getCompanyDetails()->companyName;
        $folderName = str_replace(" ", "_", $folderName);
        $folderName = strtolower($folderName);

            mkdir($location.$folderName, 0777);




if (!file_exists($dir) && !is_dir($dir)) {
    mkdir($location.$folderName, 0777);

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