Smarty {if $foo} equivalent to isset()

Question

Is there a way to change the smarty core {if $foo} so that it uses the isset() and $foo|default:$foo2?

The reason I ask this is because I am getting PHP warning messages.

I understand that I can do {if isset($foo)} although it is a lot clean to write this without the isset().

Answer 1

within an {if} the expression should not throw any notices. (at least that was the case once)

you could write a simple prefilter that (with regular expressions) looks for "{if $foo}" and converts it to the equivalent {if !empty($foo)}.

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