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The blank page is because you did not enable errors display on your website. Here's how you can do it:
you probably have a PHP error because of a missing semi-colon at the end of several lines in your code but the PHP errors should speak by themselves.
I don't mean to be rude but you clearly don't have the skills required — basic PHP — to do what you are trying to do right now. Please, at least take the time to read my article carefully and adapt the code correctly.