I actually want to see the result of my code! i.e in the picture below I want to see "Hello world" not just a blue code block. How can I do this?

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A preview will show HTML but you have to 'run' the site to see output of PHP. For example, press F9 to start a debug session.

yep.
if preview executed php, just imagine what would happen if there was something like rmdir(), unlink, or sql with delete from xxx table...
or you never write anything like this and never use any 3rd party code that can do this?

Actually I'm just learning the ropes of php right now.

OK, I did do a "run" however now i get a "the page is not available" which I assume means the ide isnn't getting through online. What setting is causing this? I must have not configured something.

Thanks for the help guys