Untitled

<?php
$number = $_GET['number'];
$multiply = $_GET['multiply'];
$process = $_GET['process'];
if ($process == "%2B")
{
$output = $number + $multiply;
}
if ($process == "%2F")
{
$output = $number / $multiply;
}
if ($process == '*')
{
$output = $number * $multiply;
}
if ($process == '-')
{
$output = $number - $multiply;
}


echo $output;
?>