Smarty variable

[bene82]

I have these variables: 

$idben47    Smarty_Variable Object (3) 

->value = "0.00" 

->nocache = false 

->scope = "Smarty root" 

$idben48    Smarty_Variable Object (3) 

->value = "120.00" 

->nocache = false 

->scope = "Smarty root" 

$idben49    Smarty_Variable Object (3) 

->value = "0.00" 

->nocache = false 

->scope = "Smarty root" 

How I can dynamically get these in my tpl file? 

 

In my tpl file I already have the $id_attribute variable (47,48,49 in this case). I'm trying to do something like this: 

Prezzo:{${'idben'|cat:$id_attribute[spam-filter]

 

But the system don't get the variable... 

 

Normally if i use the number directly it works:

Prezzo:{${'idben'|48[spam-filter]

 

Thank you in advance