Laravel assigns values ​​to public templates

Many times during the development process, values ​​are assigned to public templates, such as the top navigation bar, the bottom of the page, etc. It is impossible to assign values ​​​​in every controller.

The solution in Laravel is as follows:
Modify

App\Providers\AppServiceProvider

Add

in the boot method View()->composer('common.header',function ($view){ //common.header corresponds to Blade template
                                                                                                                                     ​
});

You can also assign values ​​to all templates

View()->share('key', 'value');

======================================

View composers are related to views. They are used in the boot() function of a service provider. When a view is loaded, due to the role of view composer, it calls a certain function and passes parameters.

1, create service provider

php artisan make:provider ComposerServiceProvider

Add ComposerServiceProvider to config In

2 in /app.php, write view composer

public function boot()
    {
        view()->composer(
            'app', //模板名
            'App\Http\ViewComposers\MovieComposer'  //方法名或者类中的方法
        );
    }

which means that once app.blade.php is loaded, execute App\Http The composer function in \ViewComposers\MovieComposer (the composer function is executed here by default), if you want to change it, just

view()-> composer('app','App\Http\ViewComposers\MovieComposer<a href="https://my.oschina.net/u/862816" class="referer" target="_blank">@foobar</a>'); //Your own defined method

The foobar function is executed here

Write this <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">&lt;?php namespace App\Http\ViewComposers; use Illuminate\View\View;//**记得引入这个啊（因为在composer函数参数里使用了View类）** class MovieComposer { public $movieList = []; public function __construct() { $this-&gt;movieList = [             'Shawshank redemption',             'Forrest Gump',         ];     }     public function compose(View $view)     {         $view-&gt;with('latestMovie');     } }</pre><div class="contentsignin">Copy after login</div></div>

App\Http\ViewComposers\MovieComposer.php, and other
All templates must use *regular expression

view()->composer('*', function (View $view) {
    //logic goes here
});

If you want to specify multiple views to use, wrap them in an array

view()->composer(['nav', 'footer'],'App\Http\ViewComposers\MovieComposer');
或者
 view()->composer(['admin.admin'], function ($view){
            $column =  $this->object_array(DB::table('column')->get());
            foreach($column as $k=>$v){
                $chid = explode(',',$v['childid']);
                foreach($chid as $value){
                    $column[$k]['chname'][] =  $this->object_array(DB::table('column_child')->where('id',$value)->first());
                }
            }
            $view->with('columns',$column);
        });

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