how to pass a simple parameter in view to controller ?

[eluser]ludo31[/eluser]
[quote author="InsiteFX" date="1330125269"]

Code:

public function recevoir()
{
    $var = $this->input->post('form_value', TRUE);
        
    echo $var; exit;
}

[/quote]

it returns false

form_value does not exist even in doc ??