$oride='';
$count = "25";
$origin = $_POST["origin"];
$destinataion = $_POST["destination"];
$oride = ($destination = $_POST["destination"] -
$origin= $_POST["origin"]);
if ($oride <="0"){
echo "invalid";
}
elseif ($oride <="15"){
echo $count;
}
elseif ($oride ="16"){
echo $count + "1";
}
elseif ($oride ="17"){
echo $count + "2";
}
if statement is ok until $oride ="16" but when it reaches $oride ="17" it still choes 26 it should be 27