If you create your form fields correctly, the form helper will sort all of
this for you
echo $this->Form->select(
'Model.field',
$options,
array('multiple' => true)
);
Source: http://book.cakephp.org/2.0/en/core-libraries/helpers/form.html
I would focus on trying to get the conventions working rather forcing the
selected options. If you have your data array correct then the above will
output a multiselect form field with the right options selected.
HTH, Paul.
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