最近手残升级了项目里 Laravel 的小版本号（v5.5.39 => v5.5.45），这不升级则已，一升级就出了问题！Sentry 平台上提示错误：openssl_encrypt() expects parameter 1 to be string, array given，具体报错记录如下：ErrorExceptionopenssl_encrypt() expects parameter 1 to be string, array givenvendor/laravel/framework/src/Illuminate/Encryption/Encrypter.php in handleError at line 91vendor/sentry/sentry/lib/Raven/Breadcrumbs/ErrorHandler.php in handleError at line 34vendor/sentry/sentry/lib/Raven/Breadcrumbs/ErrorHandler.php in openssl_encryptvendor/laravel/framework/src/Illuminate/Encryption/Encrypter.php in encrypt at line 91vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php in encrypt at line 139vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php in handle at line 66vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline{closure} at line 149vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing{closure} at line 53vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in then at line 102vendor/laravel/framework/src/Illuminate/Routing/Router.php in runRouteWithinStack at line 660vendor/laravel/framework/src/Illuminate/Routing/Router.php in runRoute at line 635vendor/laravel/framework/src/Illuminate/Routing/Router.php in dispatchToRoute at line 601vendor/laravel/framework/src/Illuminate/Routing/Router.php in dispatch at line 590vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php in Illuminate\Foundation\Http{closure} at line 176vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing{closure} at line 30vendor/barryvdh/laravel-debugbar/src/Middleware/InjectDebugbar.php in handle at line 58vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline{closure} at line 149vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing{closure} at line 53vendor/fideloper/proxy/src/TrustProxies.php in handle at line 56vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline{closure} at line 149vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing{closure} at line 53vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php in handle at line 30vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline{closure} at line 149vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing{closure} at line 53vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php in handle at line 30vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline{closure} at line 149vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing{closure} at line 53vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php in handle at line 27vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline{closure} at line 149vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing{closure} at line 53vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/CheckForMaintenanceMode.php in handle at line 46vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline{closure} at line 149vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing{closure} at line 53vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in then at line 102vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php in sendRequestThroughRouter at line 151vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php in handle at line 116public/index.php at line 55仔细查看上面的异常堆栈记录，并且进行断点调试，最终确定是由于 Laravel 5.5 升级小版本后 Cookie 加密的逻辑变动所导致的报错。查阅 Laravel 官方文档（Laravel 5.5 Upgrade Guide）后得知，Laravel 新版为了防止 PHP 对象的序列化/反序列化漏洞被利用，不再对 Cookie 值进行自动的序列化和反序列化处理。举个栗子：\Cookie::queue(‘user’, [‘id’ => 1, ’name’ => ‘admin’], 720, ‘/’)Laravel 更新到 v5.5.42 后，因为 Laravel 不再自动对 Cookie 值 [‘id’ => 1, ’name’ => ‘admin’] 进行序列化处理，而 openssl_encrypt ( string $data … ) 只能加密字符串数据，这个时候程序就会抛出错误：openssl_encrypt() expects parameter 1 to be string, array given。解决方法：新版里面在中间件 AppHttpMiddlewareEncryptCookies 新增静态属性 $serialize，当设置为 true 时可开启 Cookie 值的自动序列化和反序列化处理。/** * Indicates if cookies should be serialized. * * @var bool */protected static $serialize = true;【推荐】将 Cookie 值使用 JSON 函数编码成字符串后再进行存储（获取 Cookie 值后需调用 JSON 函数进行解码）。\Cookie::queue(‘user’, json_encode([‘id’ => 1, ’name’ => ‘admin’]), 720, ‘/’);-EOF-首发于知乎专栏《PHP和Laravel学习》：https://zhuanlan.zhihu.com/p/…扫码关注《PHP和Laravel学习》微信公众号：