这两个没区别啊。。。float 验证字符串整数也成功，是bug吗？
$data = ['mix'=>'123'];
$rule = ['mix'=>'require|float'];
$validate = new Validate($rule);
$condition = $validate->check($data);
if ($condition) {
echo'成功';
exit();
}else {
echo'失败';
dump($validate->getError());
exit();
}