How to change frame color in listings package?

Question

I am using listings package for code highlighting and I want to have a different color frame around my code examples. Any ideas how to do it? There is backgroundcolor but there isn't framecolor so I can't figure out how to do it.

Answer 1

The answer has been given above. But to have at least an answer to this question I'll give an example how to use rulecolor:

\documentclass{minimal}
\usepackage{listings,color}
\lstset{
    language=PHP,
    frame=lines,
    rulecolor=\color{red}
}
\begin{document}
\begin{lstlisting}
<?php
echo 'Hello World!';
?>
\end{lstlisting}
\end{document}