Question : Add function to Zend framework for global use

I would like to add this function for use in views and controllers everytime. Any body know who to add a function to Zend php?

public function prepareForUrl($item) {
            // set and remove bad characters
            $badChars = '#[^-a-zA-Z0-9_ ]#';
            $item = preg_replace($badChars, '', $item);
            $item = trim($item);
            // change all dashed, underscores, spaces to dashes
            $item = preg_replace('#[-_ ]+#', '-', $item);
            return $item;
      }

I've tried View Helpers but I get this error:
Plugin by name 'Prepareforurl' was not found in the registry;

Thanks for any help!

Answer : Add function to Zend framework for global use

The class name must be Zend_View_Helper_*, where * is the helper name itself. E.g., if you were writing a helper called "specialPurpose", the class name would be "Zend_View_Helper_SpecialPurpose" (note the capitalization).

hope this helps