laravel框架关于搜索功能的实现

  

    

      
选择分类:
      

        
          全部
          @foreach($category as $c)
            {{$c->class_name}}
          @endforeach
        
      
      
文章标题:
      
      

      

    
  

public function article_list(){
  //echo 'zoule';exit; 测试表单是否走进方法中 大家随意写
  $shownum = 1;
  if(array_key_exists('class',$_GET)||array_key_exists('keywords',$_GET)){
   //echo '111'; 
   if($_GET['class']){
   //Article模型 leftJoin表连接 查询根据俩个表里的这些字段来执行
     $postdata = Article::leftJoin('category', function($join) {
      $join->on('article.class_id', '=', 'category.id');
     })->select(['article.id','category.class_name','article.status','article.title_editing','article.update_time'])->where('article.class_id','=',$_GET['class'])->orderBy('release_time','desc')->paginate($shownum);
   }elseif($_GET['keywords']){
     $postdata = Article::leftJoin('category', function($join) {
      $join->on('article.class_id', '=', 'category.id');
     })->select(['article.id','category.class_name','article.status','article.title_editing','article.update_time'])->where('article.title_editing','=',$_GET['keywords'])->orderBy('release_time','desc')->paginate($shownum);
    
   }else{
     $postdata = Article::leftJoin('category', function($join) {
      $join->on('article.class_id', '=', 'category.id');
     })->select(['article.id','category.class_name','article.status','article.title_editing','article.update_time'])->orderBy('release_time','desc')->paginate($shownum);
   }
  }else{
   //echo '2222';
   $postdata = Article::leftJoin('category', function($join) {
     $join->on('article.class_id', '=', 'category.id');
   })->select(['article.id','category.class_name','article.status','article.title_editing','article.update_time'])->orderBy('release_time','desc')->paginate($shownum);
  }
  //分类id不是父id
  $category = DB::table('category')->where('parent_id','!=','0')->get();
  //渲染页面 传递 参数
  return view('backend.article_list',['postdata'=>$postdata,'shownum'=>$shownum,'category'=>$category]);
}