Making PHP in real time ... !?

Hi, I would like to make some php code in real time, or read it from a database ... I would like to know if somebody is able to tell me how, in a php code, to include datas (also in PHP code) from a database and to make this code immediatly interpreted by PHP ... Example : <? echo "my HTML Page<BR>"; // Access to the database to get the data needed (oracle in our case) $mydata=('select phpcode from mytable where page=1'); // Then what can I do here to make interpreted my PHP code which is inside $mydata ?? ?> Thanks for your help ! regards, -- Hervé