Is it possible to account/trap missing arguments in functions?

For instance, say I have a function foo:

function foo($arg1,$arg2) { blah }

If someone calls that function as:


Can I somehow code around the fact that $arg2 is missing?  I've tried:

function foo($arg1,$arg2) {
    if (!isset($arg2) { $arg2=0 }

But that doesn't work.  However, that's the sort of functionality I'm looking 
for -- is there a way to do it?



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