warning: mkdir() expects at most 2 parameters, 3 given in

I have just looked at section of code from line 192:

mkdir($path, 0777, true)

But that third parameter was added as of PHP 5.0.0. Maybe you are using PHP 4?

Well yes, as I remember og_files have a strange approach when creating new directories - for example module will create dir only when you upload file in it and not before - so you create two dirs (second is in first) and dirs are not yet created on file system, then you upload file in second dir and only then og_files will first recursively create two dirs with mkdir (and that is that param 3 - true) and then upload file.

I agree this is not very intuitive and something user would not expect, but until that is changed you would have to switch to php 5 for this.

Yep, right now you *do* need PHP5, but as far as know PHP4 is already unsupported, so I would recommend you to upgrade as fast as possible. ;)

check this method instead

function checkPath($filePath, $permission = 0777) {
    $parts = array_filter(explode("/", $filePath));

    $rootPath = "";

    //removing file name from parts
    array_pop($parts);

    foreach ($parts as $path) {
        if (! file_exists($rootPath .= "/$path")) {
            if (! mkdir($rootPath, $permission)) {
                return false;
            }
            continue;
        }
    }
    
    return true;
}

you could test this via https://phpbox.info/19JsM