need smarty function, it will change digit to words

I need to display digit as a word in smarty,

ie.,

In PHP I pass the value $Rank = 2 to samrty 
by
$smarty->assign('Rank', $Rank);

Then, it will be display in samrty as "two".

Any inbuilt function is there?

开发者_Python百科Thanks

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There is no function for this. Though it would be pretty easy to make one.

http://www.smarty.net/docsv2/en/plugins.tpl