Why this multidimensional array isn't received in PHP using Ajax?

Question

I am posting a multidimensional array from JS using Ajax call and I dont received it in PHP:

   $.ajax({
    type: 'post',
    url: 'external_submit.php',
    dataType: "json",
    data: {
      edit_rfid_changes_submit: edit_rfid_changes_submit,
      edited_rfid_arr: edited_rfid_arr
   }

I am 100% sure I have done this before and it always succeeded, why doesn't work this time is beyond me!

EDIT:

this is how I am creating the array:

  var edited_rfid_arr = [];
  for (var i = 0; i < input_fields.length; i++) {       
      let obj = [];
      let rfid = input_fields[i].value;
      let id = input_fields[i].attributes['data-rfid_id'].value;
      obj['rfid'] = rfid;
      obj['id'] = id;
      edited_rfid_arr.push(obj);      
  }

Your value of edited_rfid_arr is not valid. In JS, you can only use key: value in objects, not arrays. It should be [{rfid: "45456", id: "69"}, ... — Barmar
– Barmar, Commented Jan 14, 2021 at 21:33
In PHP, you should then be able to access them as $_POST['edited_rfid_arr'][$i]['rfid'] and $_POST['edited_rfid_arr'][$i]['id'] — Barmar
– Barmar, Commented Jan 14, 2021 at 21:34
@Barmar pelase check the edited question, I mistakenly typed a wrong format of the array before. Now the question is corrected — showtime
– showtime, Commented Jan 14, 2021 at 21:39

Barmar · Accepted Answer · 2021-01-14 21:44:44Z

1

You should make obj a plain object, not an array. Although you can add named properties to arrays (since arrays are just a kind of object), the properties are ignored when jQuery serializes the array.

So change the variable declaration to:

let obj = {};

Or you could get rid of the obj variable entirely, and just do:

edited_rfid_arr.push({rfid, id});

And you can get rid of the entire loop by using map():

var edited_rfid_arr = input_fields.map(field => 
    ({rfid: field.value, id: field.attributes['data-rfid_id'].value}));

answered Jan 14, 2021 at 21:44

Barmar

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