exit; } if (!$number2) { echo "You must enter number 2!"; exit; } if (!$oper) { echo "You must select an operation to do with the numbers!"; exit; } if (!eregi("[0-9]", $number1)) { echo "Number 1 MUST be numbers!"; exit; } if (!eregi("[0-9]", $number2)) { echo "Number 2 MUST be numbers!"; exit; } if ($oper == "add") { $calc->add($number1, $number2); } if ($oper == "subtract") { $calc->subtract($number1, $number2); } if ($oper == "divide") { $calc->divide($number1, $number2); } if ($oper == "multiply") { $calc->multiply($number1, $number2); } }