how to use the variable from if isset $_POST output? - php

Question

How do I use the value of variable $dd i.e 10 or 100000 outside the if condition?
I want to show that status(available/not available) and the $dd value in separate locations.
ajax success
success: function (response) {
$("#uname_response").html(response);
}
if(isset($_POST['applied_promocode'])){
$applied_promocode = $_POST['applied_promocode'];
$dd = 0;
// Check applied_promocode
$stmt = $dbh->prepare("SELECT count(*) as cntUser FROM coupon WHERE applied_promocode=:applied_promocode");
$stmt->bindValue(':applied_promocode', $applied_promocode, PDO::PARAM_STR);
$stmt->execute();
$count = $stmt->fetchColumn();
//Availability message
if($count > 0){
$response = "<span style='color: red;'>Not Available.</span>";
$dd = 10;
} else {
$response = "<span style='color: green;'>Available.</span>";
$dd = 100000;
}
echo $dd;
echo $response;
exit;
}
$discount_price = $dd * 100;

Answer 1

You can choose to send back data in JSON format if you want to be able to pass complex data (i.e. non-string value). The way to do that would be as follows:
Untested code
if($count > 0){
$response = "Not Available";
$dd = 10;
} else {
$response = "Available";
$dd = 100000;
}
$discount_price = $dd * 100;
$json_data = array('response'=>$response, 'dd' => $discount_price);
echo json_encode($json_data);
Then on the client side, you can use something like this:
success: function (response) {
var json_data = JSON.parse(response);
var color = "red";
if(json_data.response == 'Available')
{
color = "green";
}
var html = "<span style='color: "+color+";'>"+json_data.response+".</span><p>"Discounted price = "+json_data.dd+"</p>";
$("#uname_response").html(html);
}
Or if you do not like concatenation, use the traditional approach to manipulate the DOM
success: function (response) {
var json_data = JSON.parse(response);
if(json_data && json_data.response)
{
var color = "red";
if(json_data.response == 'Available')
{
color = "green";
}
var span = document.createElement('span');
span.style.color = color;
span.innerHTML = json_data.response;
var p = document.createElement('p');
p.innerHTML = "Discounted price is "+json_data.dd;
var div = document.createElement('div');
div.appendChild(span);
div.appendChild(p);
$("#uname_response").html(div);
}
else
{
alert("Invalid data returned from server");
}
}