How can i count array keys in ezpublish?

i have a problem counting array keys value in ezpublish whose php function is

array_count_values();

i need a similar function in ezpublish. Is there any operators in ezpublish or i have to make an extension for it too?

Solution

After research for long time i found that, there is no any ez publish template operators for array_count_values(); we have to make an extension for it. And process of making extension is given in the link below.

http://blog.developeronhire.com/using-custom-php-functions-in-ez-publish-templates/

Thank you all