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That's happening b/c the number of bits necessary to store the number I've assigned to those 2 slots exceeds what PHP allows by default.
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From my experience, PHP doesn't have variable types like in any other programming languages where you have to specify whether it's an int, long, or whatever... isn't it? (which I think is less efficient because it will take the same amount of space each time variable is declared with the maximum) So is that the maximum by default for all types of variables in PHP?