If the script finishes, the memory is released. You're ready as is :).
No, you do not need to destroy any variable yourself (and an object is a variable) : as soon as your PHP script reaches its end, its variables will be freed, and the correspondig memory released.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.