A variable is something that does not have a fixed value. Its value varies.
So three examples might be:
1. Your weight (it does not stay absolutely constant)
2. The price of something such as a bottle of coke.
3. The temperature.
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Hard to tell, variables usually are in the memory... be more specific.
Term- a number, a variable, or a product of numbers and variables.
10 to 100, 2 to 20, 156 to 1560 are three examples.
As it is, PHP does not have a preprocessor; it is a preprocessor that processes form variables and other environmental variables and prints HTML or general text.
Variables