//set the franchise number
$franNumber     = $_SESSION['franNumber'];
//set the date
$currentDate     = $_SESSION['currentDate'];
//set current Time
$currentTime    = $_SESSION['currentTime'];

$prefix = $franNumber . "_" . $currentDate . "_" . $currentTime;

// Clean the fileName for security reasons
$oldFileName = preg_replace('/[^\w\._]+/', '_', $oldFileName);

for ($i=0; $i < 51; $i++) { 
    //Add the fran#+_+TIMESTAMP+_oldfilename
    $fileName = $prefix . "_" . $oldFileName;

    // Make sure the fileName is unique but only if chunking is disabled
    if ($chunks < 2 && file_exists($targetDir . DIRECTORY_SEPARATOR . $fileName)) {
        $ext = strrpos($fileName, '.');
        $fileName_a = substr($fileName, 0, $ext);
        $fileName_b = substr($fileName, $ext);

        $count = 1;
        while (file_exists($targetDir . DIRECTORY_SEPARATOR . $fileName_a . '_' . $count . $fileName_b))
            $count++;

        $fileName = $fileName_a . '_' . $count . $fileName_b;
    }
}
$filePath = $targetDir . DIRECTORY_SEPARATOR . $fileName;