Average MPH and MPG Calculator

if($mpg_errors != 0) {$mpg_error_msg = “Please enter proper values!”;}
else
{
$total_mpg = $_POST[‘mpg_miles’] / $_POST[‘mpg_gallons’];
$view_total_mpg = ”   Miles per Gallon = “.$total_mpg;
}
}
//–Miles Per Hour————————————–
//Miles Per Hour = miles / hours
if($_POST[‘a’] == “mph”)
{
$mph_miles = $_POST[‘mph_miles’];
$mph_hours = $_POST[‘mph_hours’];
$mph_errors = 0;
if($_POST[‘mph_miles’] == “”) {$mph_errors++;}
else { if(!is_numeric($_POST[‘mph_miles’])) {$mph_errors++;} }
if($_POST[‘mph_hours’] == “”) {$mph_errors++;}
else { if(!is_numeric($_POST[‘mph_hours’])) {$mph_errors++;} }

if($mph_errors != 0) {$mph_error_msg = “Please enter proper values!”;}
else
{
$total_mph = $_POST[‘mph_miles’] / $_POST[‘mph_hours’];
$view_total_mph = ”   Miles Per Hour = “.$total_mph;
}
}
//===============================================
$content = ‘

‘;

$content = addslashes($content);
$content = “\$result=\””.$content.”\”;”;
eval($content);
print stripslashes($result);
[/insert_php]