thinkphp5.1修改添加配置项

/**
 * 修改扩展配置文件.
 *
 * @param array  $arr  需要更新或添加的配置
 * @param string $file 配置文件名(不需要后辍)
 *
 * @return bool
 */
function config_set($arr = [], $file = 'dome')
{
    if (is_array($arr)) {
        // 文件路径
        $filepath = Env::get('config_path').$file.'.php';
        // 检测是否存在,不存在新建
        if (!file_exists($filepath)) {
            $conf = '<?php return [];';
            file_put_contents($filepath, $conf);
        }
        // 添加配置项
        $conf = include $filepath;
        foreach ($arr as $key => $value) {
            $conf[$key] = $value;
        }
        // 修改配置项
        $str = "<?php\r\nreturn [\r\n";
        foreach ($conf as $key => $value) {
            // dump(gettype($value));
            switch (gettype($value)) {
                case 'string':
                    $str .= "\t'$key' => '$value',"."\r\n";
                    break;
                case 'number':
                    $str .= "\t'$key' => $value,"."\r\n";
                    break;
                case 'boolean':
                    $str .= "\t'$key' => ".($value?'true':'false').","."\r\n";
                    break;
                default:
                    # code...
                    break;
            }
        }
        $str .= '];';
        // 写入文件
        // dump($str);exit;
        file_put_contents($filepath, $str);

        return true;
    } else {
        return false;
    }
}