PHP that display prompt messages

I developed a php code in reading from file the values of x and y.
difficulties facing with the program should read and display it line by line. After each line is display, ask the user if he/she wants to modify these values. if yes, the user types the new x and y values. when you finish computing/displaying the linear regressions parameters (already in the code), save the values in another file.

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Make sure re-entered values are not illegaling (<= 0) or (text, characters) only greater than zero numeric.

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What’s the issue you have faced and what are they?
And your real full name for exam documentation?

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