[IntoRain]

I like to use forms the same way it's used in registerview.php. I find it more simple and I think it's a good example.

Unless it's ajax, you don't need to have the action code in a different function at all:

In registerview.php you will notice this line:

$securityField->add(new Button("Register", "submit", "submit"));

The form is sending through POST and you might notce the "submit" in the button above:

if($mysidia->input->post("submit"){
//means the button was clicked, check sent data here
}

And all inputs can be checked like that:

$requiredField->add(new TextField("username"));
$mysidia->input->post("username");//in register.php

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You want a class in the classes folder or to create a new page?