distance.php
Source of distance.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Distance Results</title>
</head>
<body>
<?php
//get variables from form
$cityName = array("Indianapolis", "New York", "Tokyo", "London");
$from = filter_input(INPUT_POST, "from");
$to = filter_input(INPUT_POST, "to");
$distance = array(
array(0, 648, 6476, 4000),
array(648, 0, 6760, 3470),
array(6476, 6760, 0, 5956),
array(4000, 3470, 5956, 0));
//calculate and display distance
$result = $distance[$from][$to];
print "<h1>Distance from $cityName[$from] to $cityName[$to] is $result miles</h1>\n";
?>
</body>
</html>