1. User fills the form.
When the user clicks next button, form fields are saved to the
session variable.
// Save to session
$this->Session->write('mydata', this->data);
2. User is displayed with the data he entered before to confirm.
3. If the data is incorrect (Recall controller) something like
redo_edit action:
// Restore from session
$this->data = $this->Session->read('mydata');
// Display edit page
<snip>
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