Add strings together in PHP

[AmazingAnt]

Ok, this is a really stupid question that I should already know the answer to, but i've always just worked around my not knowing this. Unfortunatly, I can't work around it this time. How do I take string $data, which has text in it already, and add the text from $atad to it?

[hitecbill]

$a="abc";

$b="def";

$c="$a$b";


outputs:
"abcdef"

:)

[NogDog]

$data .= $atad;

(Note the .= operator.)

[AmazingAnt]

thanks to both. Like I said, really stupid question, but if I never ask it, then i'll never know.
Oh, nogdog. I'd like to ask you a question about the fputcsv() thing, and so i'm gonna post my question in the original csv thread.