[Solved] Using a function in php

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The problem is likely because you are mixing $op and $_POST[‘operation’]. Also, you have a concern about your if statements. Because you return in each one, you can simplify this a great deal without increasing runtime complexity.

function total($num1, $num2, $op) {
  if($op == "+")
    return "$num1 + $num2 = ".($num1 + $num2);
  if($op == "-")
    return "$num1 - $num2 = ".($num1 - $num2);
  if($op == "https://stackoverflow.com/")
    return "$num1 / $num2 = ".($num1 / $num2);
  return "$num1 * $num2 = ".($num1 * $num2);
}

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solved Using a function in php