I am trying to get data from input generated by math.random to php by
Java Script

id = Math.floor(Math.random() * 100000); 
document.getElementById('uid').value = id; // pastes it in input values

<div class="col-md-4">
  <label for="validationCustomUsername" class="form-label">
    ID
  </label>
  <div class="input-group has-validation">
    <input value="rr" type="text" disabled class="form-control" placeholder="auto generated" name="uid" id="uid" aria-describedby="inputGroupPrepend">
    <div class="invalid-feedback">
      Please choose a username.
    </div>
  </div>
</div>
<script>randomized()</script> // function right after input 

$uid = $_POST['uid'];
echo  $uid;

The data does shows up in the input text area but not when i echo with php
the script does not breaks (php stops working after error) since i tested echoing another variable after it and it shows up on page

I tried print_r() as well as submit button but no hope.

The javascript is executed infact before php code.

what i thought was that it would echo the uid without nay problems but i think the javascript is loaded after php or something for it to stop working but that should not be the case since html follows left to right rule