$data = $request->input();

$rules = [

'id' => 'required|numeric',

'age' => 'required|numeric|max:150',

'name' => 'required|max:20', //sometimes的用意（不传则已，传则必须遵守规则）

];

$messages = [

'required' => ':attribute不能为空',

'numeric' => ':attribute必须是数字',

'max' => ':attribute长度（数值）不应该大于 :max',

];

$attributes = [

'id' => 'ID',

'age' => '年龄',

'name' => '名称',

];

$validator = \Validator::make($data, $rules, $messages, $attributes);

if ($validator->fails()) {

return $validator->errors()->all(); //显示所有错误组成的数组

//return $validator->errors()->first(); //显示第一条错误

} else {

return 'validate passed';

}