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Do I have to actually completely read the book?

Iam stuck on this challenge for some time now..
Are the Numbers some kind of hash?

Thanks for the answers, it works now

Although I explicity reassigned the variables in every iteration their values got corrupted somehow, after I added an explicit unset() for the variables it worked!

>> In your case, could previous eval()s have influenced the result of the current one?

I don't hope so. I reassigned $x and $y in every iteration and I let my other variables end with two underscores so that this eval should not influence them.

I wrote a PHP script which is trying all possible characters for all positions in the string and it found no solution. Is there a special trick? Am I looking in the wrong direction? Can I assume that $x is zero before calling the given line? The programming language of this challenge is still PHP, i...

How could I think it would be *this* trivial

Doesn't the maximum population on the dimensions of the "world"? And also the question does not say where on the screen/world the given shape should be placed.
Did I miss something?