How to do live Experiments in PHP?

Hi,

Can I create a php page something like, on which I can do live experiments.
Like on which I can write the PHP code, and then execute the same.

For example http://www.freephptest.com/

For testing purposes.

You use iframes and target the neighboring frame.

Here is another example, pick it to bits and see how they do it.

http://www.hping.org/phpinteractive/

BeachPHP maybe worth a look too.