[PHP] round up number

[Jacky]

How do I round up a lot of decimal number like 10.232656898 to be 10.23 ? Should I use 
this?
$num = 10.26564787;
$Rnum = round($num);
What would be the function I am looking for and how?
Jack
[EMAIL PROTECTED]
"There is nothing more rewarding than reaching the goal you set for yourself"