Include '<?' in a string literal

What's the cleanest way to include '<?' in a string literal ?
Simply using $foo = "some text <?" wont work.

 

$foo="some text <"."?";

would work.

 

Thanks pal.

 

Hmmm, I'm still having problems with this one.

Ok, so now I have the variable set with this:
$foo="some text <"."?";
The problem comes when I try to echo the variable:
echo $foo;

IE correctly shows: 'some text <?'
FireFox shows: 'some text'
Opera never stops loading. When I press stop it shows: 'some text'

I don't get it. What's going on?
Can anyone give a clue?

 

you should using unicode chars for show characters .
just view source of this page and you can find : '&lt;?' for showing <?

 

Yep, you're right.
I should have used:
echo htmlspecialchars($foo);

Thanks.