这里的搜索功能主要基于表单get提交实现的

<form action="/backend/auditList" method="get">  <table class="search_tab">    <tr>      <th width="120">选择分类:</th>      <td>        <select name="class" >          <option value="">全部</option>          @foreach($category as $c)            <option value="{{$c->id}}">{{$c->class_name}}</option>          @endforeach        </select>      </td>      <th width="70">文章标题:</th>      <!--查询关键词-->      <td><input type="text" name="keywords" placeholder="文章标题"></td>      <td><input type="submit" name="sub" value="查询"></td>    </tr>  </table></form>

php部分逻辑

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]);}