Laravel5的Request、Session、Response、中间件

1、Request

<?php
namespace App\Http\Controllers;
use Illuminate\Support\Facades\DB;
use App\Student;
use Illuminate\Http\Request;

class StudentController extends Controller
{

	public function index(Request $request){
		//1、取值
		echo $request->input('name','unknown');
	
		if ($request->has('name')) {
			echo $request->input('name');
		}else{
			echo "string";
		}
		$res = $request->all();
		dd($res);

		//2、判断请求类型:GET、POST
		if ($request->isMethod('GET')) {
			echo "Yes";
		}else{
			echo "No";
		}
		$res = $request->ajax();
		var_dump($res);

		//3、判断路由是否符合一定的格式
		$res = $request->is('test2/*');
		$res = $request->url();
		var_dump($res);
	}
}

2、Session

Route::group(['middleware'=>['web']],function(){
	Route::any('session',['uses'=>'StudentController@sessionTest']);
});

<?php
namespace App\Http\Controllers;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Session;
use App\Student;
use Illuminate\Http\Request;

class StudentController extends Controller
{

	public function sessionTest(Request $request){
		//1、HTTP request session()
		$request->session()->put('key1','value1');
		echo $request->session()->get('key1','default');
		//2、辅助函数
		session()->put('key2','value2');
		echo session()->get('key2','default');
		//3、Session类
		Session::put('key3','value3');
		echo Session::get('key3','default');
		//以数组形式存储数据
		Session::put(['key4'=>'value4']);
		echo Session::get('key4','default');
		//把数据放到Session数组中
		Session::push('student','Leroi');
		Session::push('student','Li');
		$res = Session::get('student','default');
		//取出数据并删除
		$res = Session::pull('student','default');
		//取出所有的值
		$res = Session::all();
		var_dump($res);
		//判断session中某个key是否存在
		if (Session::has('key8')) {
			$res = Session::all();
			dd($res);
		}else{
			dd('no');
		}
		//删除session中指定的key值
		$res = Session::forget('key1');
		var_dump($res);
		//删除session所有数据
		Session::flush();
		//赞存数据，只能用一次
		Session::flash('key-flash','val-flash');
		echo Session::get('key-flash');
		echo Session::get('key-flash');
	}
}

3、Response

<?php
namespace App\Http\Controllers;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Session;
use Illuminate\Contracts\Routing\ResponseFactory;
use App\Student;
use Illuminate\Http\Request;

class StudentController extends Controller
{

	public function responseTest()
	{
		//响应json
		//$data = [
		//	'errCode'=>0,
		//	'errMsg'=>'success',
		//	'data'=>'Leroi',
		//];
		//return response()->json($data);

		//重定向//并带上数据
		//return redirect('sessionTest')->with('message','我是快闪数据');
		//action()
		//return redirect()->action('StudentController@sessionTest')->with('message','我是快闪数据');
		//route......
		//返回上一页
		return redirect()->back();

	}

4、中间件

https://laravel-china.org/docs/laravel/5.5/middleware/1294