function default args using vars

[rpanning]

Is it possible to set default arguments using variables in a function/method? For example I'm using something like:

function ($arg=$var) {
  //code
}

When I use that I get an unexpected T_VARIABLE parse error. For the $var I've tried using $_SERVER["DOCUMENT_ROOT"] and $this->var. This is in a class but I've also tried just a normal function and got the same result. I can set a string as default, ex: $arg="default", and it works fine of corse. Any ideas on this one?

Thanks,
Ryan

[xblue]

No, this syntax is not valid as far as I know. It simply wouldn't make sense in most cases, thinking about variable scope.

But since the server variables are super globals, you could put it this way:

function your_function ($arg='') 
{
    if (!$arg){
        $arg=$_SERVER["DOCUMENT_ROOT"];
    }
    // code
}

Hope this helps,
xblue