Getting empty array in PHP while using $.ajax

Question

I have this jQuery $.ajax script:

var data = JSON.stringify( selected_products );

$.ajax({ type: "POST", 
    url: "addtocart.php", 
    data: data, 
    dataType: 'application/json'
});

And I am posting this to a really simple PHP script:

$selected_products = json_decode($_POST['data'], true);
print_r($selected_products);

This is an example of what I'm sending; this is outgoing data in Chrome DevTools:

data:[{"id":"RECOLOURBALM","option":"Black","quantity":1},{"id":"TOWELS","quantity":1}]

However this is the console readout for the response:

Array
(
)

I think the request is succeeding and data is being passed, but the responses are all empty.

What am I doing wrong?

This could possibly help https://stackoverflow.com/questions/22851766/why-is-json-decodedata-true-converting-an-array-to-a-string — Gezzasa, Nov 17 '17 at 11:22
https://stackoverflow.com/questions/18866571/receive-json-post-with-php — Harish Kommuri, Nov 17 '17 at 12:11
This question comes up a lot and has been answered many times before. Check one of the links above — Darragh Enright, Nov 17 '17 at 12:44

Darshan · Accepted Answer · 2017-11-17T16:05:35.530

3

$selected_products = json_decode($_POST['data'], true);
echo $selected_products[0]['id'];
echo '<br>';
echo $_POST;
echo '<br>';
var_dump($_POST);

add data to your post

You are now getting null that's because of the stringify given there. Please change the code like this.It will surely work.

var data=[{"id":"RECOLOURBALM","option":"Bordeaux","quantity":1},{"id":"TOWELS","quantity‌":1}];
//data = JSON.stringify(data);
$.ajax({ 
    type: "POST", 
    url: "addtocart.php", 
    data: {'data':data}, 
    success:function(returndata){
        console.log(returndata);
    }
});

Remove the stringify.

edited Nov 17 '17 at 16:05

answered Nov 17 '17 at 11:20

Darshan

345
6
24

Thanks for the reply! My response is now:

NULL – Aaranihlus Nov 17 '17 at 11:22
print $selected_products remove all the other lines..what's the out put – Darshan Nov 17 '17 at 11:23
also add a datatype as json in the ajax – Darshan Nov 17 '17 at 11:24
For print($selected_products); I get no response? – Aaranihlus Nov 17 '17 at 11:27
add contentType: 'application/json' to the ajax.. did you get anything when printing $_post variable – Darshan Nov 17 '17 at 11:31
print ($_POST) gave me nothing. Also how do I change the data type for the shorthand $.post? have updated op – Aaranihlus Nov 17 '17 at 11:44
user this instead of $.post $.ajax({ type: "POST", url: url, data: data, success: success, dataType: dataType }); – Darshan Nov 17 '17 at 12:08
Okay, I have updated the OP with the code you provided, but I'm still not getting anything? – Aaranihlus Nov 17 '17 at 12:29
can you try this $selected_product=json_decode(file_get_contents('php://input'), true); – Darshan Nov 17 '17 at 12:32
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/159224/discussion-between-darshan-and-aaranihlus). – Darshan Nov 17 '17 at 12:33

Harish Kommuri · Answer 2 · 2017-11-17T12:37:12.343

1

If the Content-Type is set to application/json, you have to receive data as follows.

$data = json_decode(file_get_contents('php://input'), true);

$_POST will receive the data from request, which has Content-Type: x-www-form-urlencoded(Form Data)

edited Nov 17 '17 at 12:37

answered Nov 17 '17 at 12:10

Harish Kommuri

2,825
1
22
28

Getting empty array in PHP while using $.ajax

2 Answers2