//动态修改env文件
$path = base_path('.env');
if (file_exists($path)) {
    //Try to read the current content of .env
    $current = file_get_contents($path);   

    //Store the key
    $original = [];
    if (preg_match('/^XCHACHA_KEY=(.+)$/m', $current, $original)) { 
    //Write the original key to console
        $this->info("Original XChaCha key: $original[0]"); 

    //Overwrite with new key
        $current = preg_replace('/^XCHACHA_KEY=.+$/m', "XCHACHA_KEY=$b64", $current);

    } else {
    //Append the key to the end of file
        $current .= PHP_EOL."XCHACHA_KEY=$b64";
    }
    file_put_contents($path, $current);
}
$this->info('Successfully generated new key for XChaCha');