laravel5.8笔记四：中间件

应用场景：检测登陆，控制器加载数据，传递常量

命令

//中间件创建命令
php artisan make:middleware Check

注意：

1.需要注册中间件

2.中间件命名不能重复

middleware/Check.php代码

<?php
namespace App\Http\Middleware;
use Closure;
class Check
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        echo 'middleware-check';
        return $next($request);
    }
}

注册中间件app\Http\Kernel.php

routeMiddleware注册

protected $routeMiddleware = [
        /*
         * 注册中间件
         * Author:MR.zhou
         * */
        'check' =>Middleware\Check::class,
        'goods' =>Middleware\Goods::class,

    ];

middlewareGroups注册

protected $middlewareGroups = [
        'web' => [
            \App\Http\Middleware\EncryptCookies::class,
            \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
            \Illuminate\Session\Middleware\StartSession::class,
            // \Illuminate\Session\Middleware\AuthenticateSession::class,
            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
            \App\Http\Middleware\VerifyCsrfToken::class,
            \Illuminate\Routing\Middleware\SubstituteBindings::class,
        ],

        'api' => [
            'throttle:60,1',
            'bindings',
        ],
        // 正常
        'dds' =>[
            'goods',
            'check'
        ],
        /*
         * 错误示范
         * 命名重复： check与routeMiddleware下的check命名重复，路由调用的时候会出错。
         * */
        'check' =>[
            'goods',
            'check'
        ]

路由调用

// 中间件群组 (b.验证登陆)
    Route::group(['middleware' => ['check']], function () {
       Route::get('/show','IndexController@show');
    });
// 可以调用goods、check两个中间件
Route::group(['middleware' => ['dds']], function () {
　　Route::get('/show','IndexController@show');
});

Route::get('admin/profile', function () {
    //
})->middleware('auth');

Route::get('/', function () {
    //
})->middleware('first', 'second');

场景一：加载常量

Middleware\Constant.php

<?php

namespace App\Http\Middleware;

use Closure;

class Check
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        define('VERSION','5.8');
        return $next($request);
    }
}

Kernel.php注册常量

protected $routeMiddleware = [
        'auth' => \App\Http\Middleware\Authenticate::class,
        'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
        'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
        'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
        'can' => \Illuminate\Auth\Middleware\Authorize::class,
        'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
        'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,
        'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
        'verified' => \Illuminate\Auth\Middleware\EnsureEmailIsVerified::class,
        'check'=>Middleware\Check::class  // 注册常量
    ];

路由调用：

public function index(){
        echo VERSION;
    }

页面输出：123456

场景二：检测登陆；方法跟上面基本一样

需要掌握的技巧：基本路由加载中间件，加载多个中间件，群组中间件