Laravel

form.blade.php

@extends('layouts.admin-master')

@section('styles')
    <link rel="stylesheet" href="{{ URL::asset('src/css/form.css') }}" type="text/css" />
@endsection

@section('content')    
    <div class="container">            
        @include('includes.info-box')
        <form action="{{route('admin.blog.post.create')}}" method="post">
            <div class="input-group">
                <label for="title">Titulo</label>
                <input type="text" name="title" id="title" {{$errors->has('title') ? 'class=has-error' : ''}} 
                value = "{{Request::old('title')}}"/>
            </div>
            <div class="input-group">
                <label for="author">Autor</label>
                <input type="text" name="author" id="author" {{$errors->has('author') ? 'class=has-error' : ''}} 
                value ="{{Request::old('author')}}"/>
            </div>
            <div class="input-group">
                <label for="category_select">Categorias</label>
                <select name="category_select" id="category_select">
                    <option value="Categoria teste ID">Categoria teste</option>
                </select>
                <button type="button" class="btn">Adicionar categoria</button>
                <div class="added-categories">
                    <ul></ul>
                </div>
                <input type="hidden" name="categorias" id="categories" />
            </div>
            <div class="input-group">
                <label for="body">Post</label>
                <textarea name="body" id="body" rows="12" {{$errors->has('body') ? 'class=has-error' : ''}} {{Request::old('body')}}></textarea>
            </div>
            <button type="submit" class="btn">Criar post</button>
            <input type="hidden" name="_token" value="{{Session::token()}}"/>
        </form>    
    </div>
@endsection

@section('scripts')
    <script type="text/javascript" src="{{URL::asset('src/js/posts.js')}}"/>
@endsection

info-box.blade.php

@section('styles')
    <link rel="stylesheet" href="{{ URL::asset('src/css/common.css') }}"/>
@append

@if(Session::has('fail'))
    <section class="info-box fail">
        {{ Session::get('fail') }}
    </section>
@endif

@if(Session::has('success'))    
    <section class="info-box success">
        {{ Session::get('success') }}
    </section>
@endif

@if(count($errors)>0)
    <section class="info-box fail">
        <ul>
           @foreach($errors->all() as $error)
                <li>{{ $error }}</li>
           @endforeach     
        </ul>
    </section>
@endif

PostController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Post;

class PostController extends Controller{
    
    public function getBlogIndex() {
        return view('front-end.blog.index');
    }
    
    public function getSinglePost($post_id, $end='front-end') {
        return view($end . '.blog.post');
    }
    
    public function getCreatePost() {
        return view('admin.blog.create_post');
    }
    
    public function postCreatePost(Request $request){
        $this->validate($request, [
            'title' => 'required|max:120|unique:posts',
            'author' => 'required|max:80',
            'body' => 'required'
        ]);
        
        $post = new Post();
        $post->title = $request['title'];
        $post->author = $request['author'];
        $post->body = $request['body'];
        $post->save();
                
        return redirect()->route('admin.index')->with(['success' => 'Post criado com sucesso!']);
    }
}

routes.php

<?php

Route::group(['middleware' => ['web']], function(){
    
    Route::group(['prefix' => '/admin'], function(){
        Route::get('/', [
            'uses' => 'AdminController@getIndex',
            'as' => 'admin.index'
        ]);
        
        Route::get('/blog/posts/create', [
            'uses' => 'PostController@getCreatePost',
            'as' => 'admin.blog.create_post'
        ]);
        
        Route::post('/blog/post/create', [
            'uses' => 'PostController@postCreatePost',
            'as' => 'admin.blog.post.create'
        ]);
    });
});