又有一段時間沒有學習了!迷茫，除了迷茫還是在迷茫！最近，公司接了一個laravel的項目，可惜沒有phper，于是開始學習laravel，現在的情況就是還沒學會走路就要開始跑了，所以遇到坑會摔得很痛！

安裝步驟(5.3.*)

                
 composer global require "laravel/installer" 
 composer create-project --prefer-dist laravel/laravel blog "5.3.*"

出現的問題

報錯: php.ini 缺少mbstring

  laravel/framework v5.4.9 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

解決: 放開注釋extension=php_mbstring.dll

報錯: The only supported ciphers are AES-128-CBC and AES-256-CBC

解決: 先運行這個命令

  
  php artisan key:generate

再運行

  php artisan config:clear

錯誤顯示他的配置默認去C:/php/ext/下去找openssl.dll文件
解決: 他開的是虛擬機，修改extension_dir = "./" 路徑為絕對路徑

報錯:

  TokenMismatchException in VerifyCsrfToken.php line 68:
  in VerifyCsrfToken.php line 68
  at VerifyCsrfToken->handle(object(Request), object(Closure)) in Pipeline.php        line 137
  at Pipeline->IlluminatePipeline{closure}(object(Request)) in Pipeline.php         line 33
  at Pipeline->IlluminateRouting{closure}(object(Request)) in       ShareErrorsFromSession.php line 49
  at ShareErrorsFromSession->handle(object(Request), object(Closure)) in      Pipeline.php line 137
  at Pipeline->IlluminatePipeline{closure}(object(Request)) in Pipeline.php         line 33
  at Pipeline->IlluminateRouting{closure}(object(Request)) in StartSession.php      line 64
  at StartSession->handle(object(Request), object(Closure)) in Pipeline.php line      137
  at Pipeline->IlluminatePipeline{closure}(object(Request)) in Pipeline.php         line 33
  at Pipeline->IlluminateRouting{closure}(object(Request)) in       AddQueuedCookiesToResponse.php line 37
  at AddQueuedCookiesToResponse->handle(object(Request), object(Closure)) in      Pipeline.php line 137
  at Pipeline->IlluminatePipeline{closure}(object(Request)) in Pipeline.php         line 33
  at Pipeline->IlluminateRouting{closure}(object(Request)) in       EncryptCookies.php line 59
  at EncryptCookies->handle(object(Request), object(Closure)) in Pipeline.php         line 137
  at Pipeline->IlluminatePipeline{closure}(object(Request)) in Pipeline.php         line 33
  at Pipeline->IlluminateRouting{closure}(object(Request)) in Pipeline.php line         104
  at Pipeline->then(object(Closure)) in Router.php line 655
  at Router->runRouteWithinStack(object(Route), object(Request)) in Router.php        line 629
  at Router->dispatchToRoute(object(Request)) in Router.php line 607
  at Router->dispatch(object(Request)) in Kernel.php line 268
  at Kernel->IlluminateFoundationHttp{closure}(object(Request)) in         Pipeline.php line 53
  at Pipeline->IlluminateRouting{closure}(object(Request)) in       EnableCrossRequestMiddleware.php line 19
  at EnableCrossRequestMiddleware->handle(object(Request), object(Closure)) in        Pipeline.php line 137
  at Pipeline->IlluminatePipeline{closure}(object(Request)) in Pipeline.php         line 33
  at Pipeline->IlluminateRouting{closure}(object(Request)) in       CheckForMaintenanceMode.php line 46
  at CheckForMaintenanceMode->handle(object(Request), object(Closure)) in         Pipeline.php line 137
  at Pipeline->IlluminatePipeline{closure}(object(Request)) in Pipeline.php         line 33
  at Pipeline->IlluminateRouting{closure}(object(Request)) in Pipeline.php line         104
  at Pipeline->then(object(Closure)) in Kernel.php line 150
  at Kernel->sendRequestThroughRouter(object(Request)) in Kernel.php line 117
  at Kernel->handle(object(Request)) in index.php line 54
  at require_once("E:phpStudyWWWmylaravellogpublicindex.php") in       server.php line 21

原因：laravel為了防止跨站腳本攻擊(CSRF),會自動為每個活躍用戶的會話生成一個 CSRF「令牌」。該令牌用于驗證經過身份驗證的用戶是否是向應用程序發出請求的用戶。
解決：在app/Http/Middleware/VerifyCsrfToken中放行需要訪問的地址。如

  protected $except = [
      //
      /*,
      /wechat,
  ];

運行命令

   php artisan make:middleware EnableCrossRequestMiddleware

自動在app/Http/Middleware下生成一個EnableCrossRequestMiddleware.php

  
   



            }
                
   
增加中間件內容
        server("HTTP_ORIGIN") ? $request->server               ("HTTP_ORIGIN") : "";
                $allow_origin = [
                    "http://localhost:8000", // 允許跨域的列表了，可自行修改
                ];
                if (in_array($origin, $allow_origin)) {
                    $response->header("Access-Control-Allow-Origin", $origin);
                    $response->header("Access-Control-Allow-Headers", "Origin,             Content-Type, Cookie, X-CSRF-TOKEN, Accept, Authorization,             X-XSRF-TOKEN");
                    $response->header("Access-Control-Expose-Headers", "Authorization,             authenticated");
                    $response->header("Access-Control-Allow-Methods", "GET, POST, PATCH,                PUT, OPTIONS");
                    $response->header("Access-Control-Allow-Credentials", "true");
                }
                return $response;
            }
        }

    在內核文件注冊該中間件(在 AppHttpKernel 類的 $middleware 屬性添加，這里注冊的中間件屬于全局中間件)

            protected $middleware = [
                // more
                AppHttpMiddlewareEnableCrossRequestMiddleware::class,
            ];


⑥composer安裝報錯

報錯：win7下使用命令行安裝的composer使用時莫名其妙報錯
[JsonSchemaExceptionResourceNotFoundException] file_get_contents(file://): failed to open stream: No such file or directory
解決：下載Composer-Setup.exe，重新安裝composer