laravel表单验证 Validator

$validator = \Validator::make($request->input(), ['login_name' => 'required|min:5|max:30','password' => 'required|min:5|max:50|string',], ['login_name.required' => '用户名不能为空','login_name.min' => '用户名不能少于5个字符','login_name.max' => '用户名不能大于30个字符','password.required' => '密码不能为空','password.min' => '密码不能少于5个字符','password.max' => '密码不能大于50个字符','password.string' => '账号或密码不正确',
]);
if ($validator->fails()) {$a =  $validator->errors()->all(); //显示所有错误组成的数组$b = $validator->errors()->first();//显示第一条错误echo "验证未通过";
} else {echo '验证通过';
}