$rule = [
  // 不可以在此处定义空的验证 如 'name' => '',会导致出现result未定义错误
  'name' => 'require|max:25',
  'age'  => 'number|between:1,120',
];

$rule = [
  'name' => ['require','max'=>25],
  'age'  => ['number','between'=>'1,120'],
];

$rule = [
  'name' => 'require|max:25|checkName:',
  'age'  => 'number|between:1,120',
];
protected function checkNmae($value)
{
  $value 是name值,可以在此处进行验证,如正则验证
}

$rule = [
  'name' => ['require','max'=>25,'checkName'=>'$rule参数'],
  'age'  => ['number','between'=>'1,120'],
  'email' => ['require', 'checkUserEmail'=>'qq.com'],
];
protected function checkName($value, $rule)
{
  $vaule 是name值,$rule为上面的$rule参数
}
protected function checkUserEmail($value,$rule)
{
  $res = preg_match('/^\w+([-+.]\w+)*@'.$rule.'$/', $value);
  if (!$res) {
    return '邮箱只能是'.$rule.'域名';
  } else {
    return true;
  }
}