function help

I'm not good with OO programming or functions either....but here goes. I know this is an easy one 🙂

I have a function like this.....

function my_function($1, $2, $3)
{
$hello = "$1$2$3";
}

how would I echo $hello after the function runs?

So if I call the function like this...

my_function(5, 10, 15);
echo $hello;

so it echos 51015?

Why not run it and see?

nope....it doesn't work

First, variables can't begin with numbers so $1 is invalid. Second, this is an issue of variable scope. So:

function foo($a, $b, $c, $d)
{
    global $hello;

$hello = "$a$b$c$d";
}

foo('r',2,'d',2);
print $hello; // r2d2