Internal Default Method Parameters

quick question, sry if its stupid.

I can't do this right?

class Myclass{

var $bob;

function myFunc($foo = $this->bob){
echo $foo;
}

}


so im doing this:

class Myclass{

var $bob;

function myFunc($foo = 'unset'){
if ($foo == 'unset')
$foo = $this->bob;

echo $foo;
}

}
]

Is this appropriate? or am i crazy, or stupid, or thinking about this all wrong?
THANKS IN ADVANCE!

your assumptions are correct, the more common solution is to use 'null' (no quotes...see below) as the default, rather than strings that could be confusing.
e.g.

function myFunc($foo=null) {
if($foo==null) {
$foo=$this->bob
}

o yes, of course!
duh. what was i thinking?

Thanks so much fr the kick in the pants.
I swear sometimes i just stare at this shtuff 2 long and i lose my mind a bit.

thanks again!