Analysis of Laravel framework template loading, variable allocation and simple routing functions

This article mainly introduces the Laravel framework template loading, variable allocation and simple routing functions. It analyzes the related principles, operating skills and precautions of the Laravel framework template loading, variable allocation and simple routing functions in the form of examples. Friends who need it can Refer to the examples below

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As the world's number one PHP framework, it is imperative to learn Laraver. Although ThinkPHP is popular in China, it is always good for you to know one more framework.

Through the previous article's method of quickly installing the Laravel framework on a local virtual machine, we have been able to successfully install Laravel

After installation, there is a routes.php in the directory laravel\app\Http File, the point is, this is the routing file that controls the entire site.

Route::get('/', function () {
 return view('welcome');
});

The above is a simple route. If you bind the route and enable the pseudo-static of apche and nginx, you can use the domain name http :xxx.com/ to visit

Then a beautiful Laraver interface will appear.

So what does return refer to? It is to return a view file. Laraver’s view file is in laravel \resources\views Below. Laraver stipulates that the view file name ends with .blade.php. Usually we need a lot of views when doing projects, so we can define many directories under views, and then

return view('index.index');

All are possible. Indicates the view file in the directory below the view. Many frameworks are like this, but the file names will be different.

The above is just a simple route that calls an anonymous function, so what? Use it in conjunction with control.

Laraver’s controller directory is under laravel\app\Http\Controllers. You can use Laraver’s own

php artisen make:controller UseController

command to create a controller, and commonly used methods have been generated in it. If we output the content under the index method of the control

If necessary, there is no definition Controller, please add the --plain parameter after it

But how to access it, please see the code

Route::get('/','UseController@index');

This example binds the current directory '/' to the control The index method under UseController

Route::get('/about','UseController@about');

Another example is this, we can access the method under the specified control at http:xxx.com/about

There are many get here, for example, you need to use post Wait, I will contact you one after another in the future.

Then there is another problem, is it very troublesome to define a route every time, so Laraver allows us to use implicit controllers

Route::controller('User','UserController');

This is to access any method under User without specifying a route, but in this case remember to follow the following format in the method

Specify the delivery method Index such as get or post, and the first method name must be capitalized. If you want to pass parameters, you should write .

in function($a). Classify variables to the blade template. Note here that unlike the thinkphp framework, we commonly use the following methods:

1:

If

$name = 'php artisen';

you can

return view('index')=>with('name',$name);

and then use {{ $name }} in the template To parse the allocated variables.

The above method is equivalent to

return view('index',['a'=>'b']);

However, when parsing in the template, you still need to use {{ $a }} to allocate variables.

2:

If

$articles = DB::table('user')->get();

uses the results of database query

I have also seen someone recommend this writing method

return view('user.dashboard.index', compact('articles'));

But this is all personal operating habits.

When using the compact function, we can directly traverse

$data = ['a','b','c'];

while using

In the case of

@foreach($data as $v)

, you can directly use {{ $v }} to traverse

3:

Of course we commonly use All are allocated arrays or objects. So generally use the following method

You can

return view('index',$data);

It should be noted that by default, PDO 'fetch' in database.php under config => PDO::FETCH_ASSOC, the default is FETCH_CLASS as the object format

So when traversing, if the default settings are not modified, the traversal will be {{ $a->v }}This, if it is an array, it is {{ $a['v'] }}

About escaping and non-escaping during loading, examples are as follows:

$a = &#39;<span style="color:red">this Laravel</span>&#39;;

{{ $a }} Output

<span style="color:red">this Laravel</span>

{{!! $aa !!}} Output in red font

'this Laravel'

Knowledge point, if the loaded variable is a one-dimensional array, the output in the template is {{ $key name}}, for example:

$data['a'] = 'this';
$data['n'] = 'that';
return view('sites.my',$data);

Then in the template

<p>我是$data分配过来的变量{{ $a }}</p>

This way OK, you cannot use

$data['a']

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