Undefined index from AJAX POST to PHP? - php

Question

I'm new to this community and a beginner with programming. I'm trying to post a JSON data with AJAX to another PHP file and my code is as follow:
--- AJAX code ---
<?php session_start(); ?>
//other codes in between
onApprove: function(data, actions) {
return actions.order.capture().then(function(details) {
//alert('Transaction completed by ' + details.payer.name.given_name);
alert(data.orderID);
// Call your server to save the transaction
return fetch('/paypal-transaction-complete', {
method: 'post',
body: JSON.stringify({
orderID: data.orderID
})
});
});
var orderid_data = data.orderID;
$.ajax({
url: "test_parse.php",
type: "POST",
data: {'order_ID': orderid_data },
success: function(data){
alert(data);
});
--- PHP code ---
var_export($_POST);
echo $_POST["order_ID"];
I've realised that my $_POST return an empty array.
Any help would be greatly appreciated :)

Answer 1

Since you open [...]test_parse.php directly in your browser, there is no POST-data present anymore, therefor its empty.
The POST-Data is part of the request. If you open it manually in the browser you perform a GET request.
What can you do to see the var_export?
You can use Chrome or Firefox for example both have Developer-Tools which allow you to trace the exact POST-Request you performed via ajax.
For Chome:
Hit F12 to open the Dev Tools
Navigate to Network
Now perform your Ajax-Post-Request and find it in the Network list. By clicking on the requests you will see all details you will need. Most Imporant for you is Response