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<?php
$num1 = $_POST["num1"];
$op = $_POST["op"];
$num2 = $_POST["num2"];
if($op == "+"){
$result = $num1 + $num2;
}else if($op == "-"){
$result = $num1 - $num2;
}else if($op == "*"){
$result = $num1 * $num2;
}else{
$result = $num1 / $num2;
}
$url = 'form_calc_receive.php?result=' . $result;
header('Location: '.$url);