ZF2 - Change name fileinput in form

[fernando_arbelo]

I wish I could save a file sent in a form with a default name and not the original file name, for example upload an image "image.jpg" and save it as "img.jpg".

Below left the code I'm using:

// in the controller
if ($form->isValid()) {
$adapter = new Http();
$field = $this->params()->fromFiles('advertencia');
$adapter->setDestination(dirname(__DIR__));

if ($adapter->receive($field['name'])) {
}
}

If someone could help me from now thank you very much!