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// Laravel Validation functions Official documentations.
https://laravel.com/docs/5.2/validation#rule-in

if ($validator->fails()) {
        			$errMsg='';
        			foreach ($validator->getMessageBag()->toArray() as $key => $value) {
        				$errMsg.='*'.$value[0]."\r\n";
        			}
        			echo json_encode(array(
                    'success' => 'error',
                    'errormsg' => $errMsg
                    ));
                    exit;
            }
/////////////////////////////////////////////////////

// if Field has value "Major" do not apply then will use "exclude_if"
'parent_first_name'=>'exclude_if:user_type,major|required',
// if Field has value "Major" then apply only , will use "exclude_unless"
'parent_first_name'=>'exclude_unless:user_type,major|required',


$validatord = Validator::make($request->all(),
            [
              'f_mg' => 'required|image|mimes:jpeg,png,jpg,gif|max:2048',
              'title' => 'required',
              'id' => 'required|int|exists:groups,id',
              'user_id' => 'exists:App\Models\User,id',
            'category_id' => 'required|exists:App\Models\Category,id'
              'event_type' => 'required|in:Normal,Monthly',
'email' => [
                            'nullable',
                            'email',
                            Rule::unique('clients')->where(function ($query) use($id) {
                                return $query->where('id','<>',$id);
                            }),
            ]
        );

          if ($validatord->fails()) {
            echo json_encode($validatord->errors());exit;
          }



/////////////////////////OR

if ($validation->fails()) {
            return response(['error'=>$validation->getMessageBag()->all()]);
        }


///////////////////////////////////////////>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
===== in Controller ====
 $validateArr = ['name' => 'required'];
$messageArr=[
              'name.required'=>'Client Name Field is Required.', 
        ];
ajax_validate_request($request, $validateArr,$messageArr);

===== in Helpers ====
function ajax_validate_request($request, $fieldsArr, $msgArr = [])
{
    $validator = \Validator::make(
        $request->all(),
        $fieldsArr,
        $msgArr
    );
    if ($validator->fails()) {
        $errMsg = '';
        // dd($validator->getMessageBag()->toArray() );
        foreach ($validator->getMessageBag()->toArray() as $key => $value) {
            $errMsg .= $value[0] . "\r\n";
        }
        echo json_encode(array(
            'success' => 'error',
            'errormsg' => $errMsg
        ));
        exit;
    }
    
}


/////////////////////////////// in View
@if ($errors->any())
    <div class="alert alert-danger">
        <ul>
            @foreach ($errors->all() as $error)
                <li>{{ $error }}</li>
            @endforeach
        </ul>
    </div>
@endif