php - Pass-by-reference for functions with varying length of functions -

I have a function with an optional number argument, something like this:

  function DoSomething () $ $ Args = funct_get_args (); // and the rest function}

In the above given function, how can I define the first argument passed from the context?

So when I call it, I am able to do this:

DoSomething (and $ first, $ second, $ third);

Just declare it in the parameter list:

  Function DoSomething (and the first $) {$ args = func_get_args (); // and the rest function} DoSomething ($ first, $ second, $ third);

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