blue-twilight/public/raw/sg-license-error.php

<?php
function btw_license_error($code, $message)
{
    // Remove an invalid license file - relevant to index.php as that's the main entry script
    $licenseFile = sprintf('%s/blue-twilight.lic', dirname(__DIR__));

    if (file_exists($licenseFile))
    {
        $number = 0;
        do
        {
            $backupFilename = sprintf('%s_invalid.%d', $licenseFile, $number++);
        } while (file_exists($backupFilename));

        // Rename or remove the file
        if (!rename($licenseFile, $backupFilename))
        {
            @unlink($licenseFile);
        }
    }

    header(sprintf('Location: license-required.php?licerror=%d', $code));
    exit();
}

function btw_loader_error()
{
    header('Location: loader-required.php');
    exit();
}
?>