http://book.cakephp.org/2.0/en/core-libraries/helpers/form.html#FormHelper::select
Always check the documentation...
If you would like to generate a select with optgroups, just pass data in
hierarchical format. This works on multiple checkboxes and radio buttons
too, but instead of optgroups wraps elements in fieldsets:
<?php
$options = array(
'Group 1' => array(
'Value 1' => 'Label 1',
'Value 2' => 'Label 2'
),
'Group 2' => array(
'Value 3' => 'Label 3'
)
);
echo $this->Form->select('field', $options);
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