Multiple Zend Multicheckbox same name

I have a Zend_Form with multiple Multicheckbox element, the thing that I want is to give them all the same name: categories[]. When I add multiple elements like this:

 $this->createElement('multiCheckbox', 'categories[]')
    ->setLabel('Category 1')
    ->addMultiOption(1, 'Subcat1')

 $this->createElement('multiCheckbox', 'categories[]')
    ->setLabel('Category 2')
    ->addMultiOption(2, 'Subcat2')
    etc...

Only the Category 2 checkboxes are displayed.

Seems that Zend has the element name as leading. Currently I workaround this with different element names开发者_开发百科 but this isn't really workable at all.

How can I solve this?

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that's not how you use multiCheckbox, use

$multicheckbox->addMultiOptions($zone);

see here a similar example addmultioption array problem in Zend

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Ended splitting them up in separate groups.