Laravel条件查询数据单条数据first，多条数据get

 1 //提交加入我们数据
 2     public function ajax_joinus(Request $request){
 3         if($request->ajax()){
 4             //接收数据
 5             //$data = $request->input();
 6             //dump($data);
 7             $data['s_aid']     = $request->input('aid');
 8             $data['s_Name']    = $request->input('username');
 9             $data['s_Tel']     = $request->input('tel');//此处要用正则验证
10             $data['s_Company'] = $request->input('company');
11             $data['s_Job']     = $request->input('job');
12             $data['s_Email']   = $request->input('email');//此处要用正则验证
13             $data['s_Time']    = date("Y-m-d H:i:s");
14             $data['s_Ip']      = $request->getClientIp();
15             //先查询数据表中同一个活动ID下有没有同一个电话号码报名的 
16             $fid = DB::table('activity_signup')->where([["s_aid",$data['s_aid']],["s_Tel",$data['s_Tel']]])->first();
17             //dd($fid);
18             if($fid){
19                 //说明已经报过名
20                 return response()->json(['code'=>201,'msg'=>'请勿重复提交']);
21             }else{
22                 //写入数据库
23                 $int = DB::table('activity_signup')->insert($data);
24                 if($int){
25                     return response()->json(['code'=>200,'msg'=>'提交成功']);
26                 }else{
27                     return response()->json(['code'=>300,'msg'=>'提交失败']);
28                 }
29             }
30 
31         }
32 
33     }

 1 //测试方法
 2     public function ceshi(){
 3         $titles = '<span style="color: rgba(52,0,0,0.74)">文章</span>标题1';
 4         $fid = DB::table('activity_signup')->where("s_aid",1)->get();
 5         dd($fid);
 6 
 7 
 8         return view('home.index.ceshi')->with('titles',$titles);
 9 
10     }