Zend_Filter_Input如何过滤和验证多维数组

I'm using Zend Framework 1.12.3.

Filtering a single dimensional array (e.g. param[]=2&param[]=3&param[]=7) is done automatically by Zend_Filter_Input recursively (i.e. similar to a string).

But if we have a multidimensional array (e.g. param[0][]=2&param[0][]=3&param[1][]=7&param[1][]=8), I can't seem to be able to validate it. I receive a notice

<b>Notice</b>: Array to string conversion in <b>C:\xampp\htdocs\project\library\Zend\Filter\StringTrim.php</b> on line <b>99</b><br />

Do you know how to filter and validate a multidimensional array in Zend_Filter_Input ?