Find all posts associated with a tag in laravel

I am building a blog with laravel where a post has many tags. I want to filter all post by a tag. means if I click on "PHP" tag I want to get all associated post.

Here is my code

I have two table first for tags and a second table for the link with posts

tag_table

 public function up()
{
    Schema::create('tags', function (Blueprint $table) {
        $table->increments('id');
        $table->string('tags');
        $table->timestamps();
    });
}

relation tag table

public function up()
{
    Schema::create('article_tag', function (Blueprint $table) {
      $table->increments('id');
      $table->integer('article_id')->unsigned();
      $table->foreign('article_id')->references('id')->on('articles');
      $table->integer('tag_id')->unsigned();
      $table->foreign('tag_id')->references('id')->on('tags');
    });
}

Article Model

class Article extends Model
{
 public function tags()
 {
  return $this->belongsToMany('App\Tag');
 }
} 

tag model

class Tag extends Model
{
  public function articles()
 {
   return $this->belongsToMany('App\Article');
 }
}

Tag Controller

 public function show($id,$name)
{
   //here I received tag id and name.

 $list->with('articles')->get();
 return view('articles.tagshow')->withList($list);

}

via Chebli Mohamed