$options['empty'], if set to true, forces the input to remain empty.
When passed to a select list, this creates a blank option with an empty value in your drop down list. If you want to have a empty value with text displayed instead of just a blank option, pass in a string to empty.
<?php echo $form->input('field', array('options' => array(1,2,3,4,5), 'empty' => '(choose one)')); ?>
Source: http://book.cakephp.org/view/201/options-empty
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