Actually, I found this, which helped me solve the problem:
http://n4.nabble.com/Zend-Form-getValue-whatever-is-empty-td659679.html
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Hi,
I have a form that successfully uploads a file to the server. I want to
improve the form by having a text input. The input is defined as follows in
the code that describes the form:
$form->addElement('text', 'filterstring');
$textElement=$form->getElement('filterstring');