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I was wondering about the percent error should i get in experiment especially in heat transfer lab Thanks in advance

Hi, I want to know whether PHP can do things like c++. In c++ we can declare an array, and then assign the value later on if we need it. eg: int test[10]; .... .... test[0] = 40; test[1] = 5; Can we do this in php? Because from most example I have seen, they declare the value inside array...