Cakephp: How to validate array - validation

Question

I need to validate user thumbnail size and type when user upload their thumbnail. But I don't know how to validate array data. So please help me
p/s: I use Cakephp 2.x
my data:
Array
(
[User] => Array
(
[id] => 45
[username] => pa7264
[password] => admin
[new_password] =>
[thumbnail] => Array
(
[name] => demo.jpg
[type] => image/jpeg
[tmp_name] => D:\OpenServer\userdata\temp\phpD2FD.tmp
[error] => 0
[size] => 13582
)
)
)

Answer 1

You need a custom validation in a pair with getimagesize() function.
Here is a quick draft for you:
//in User.php model
public $validate = array(
'thumbnail' => array(
'imageSize' => array(
'rule' => array('check_image_size'),
'message' => 'Thumbnail size is too big!'
)
)
);
// this is custom validaion function
public function check_image_size($data)
{
$imagesize = getimagesize($data['thumbnail']['tmp_name']);
if (($imagesize[0] > 600) || ($imagesize[1] > 400)){
//here we taking request data to erase image to avoid problems in view
$request = Router::getRequest();
unset($request->data['User']['thumbnail']);
return false; //validaion failed
}
return true; //validaion passed
}