How do I add PHP to full nodes? Is it possible to add PHP bits to nodes? I would like to achieve something like this:

&lt;p&gt;Some paragraph I blablabla blablabla blablabla blablabla...&lt;p&gt;
&lt;?php Some PHP code I with echo statements ?&gt;
&lt;p&gt;Some paragraph II blablabla blablabla blablabla blablabla...&lt;p&gt;
&lt;p&gt;Some paragraph III blablabla blablabla blablabla blablabla...&lt;p&gt;
&lt;?php Some PHP code II with echo statements ?&gt;
...


If yes, how can I achieve this?
You would use the PHP Filter, but I would highly recommend AGAINST it as it doesn't restrict anything, and with it, your users could enter things far more "exciting" than just echo statements...