using a echo as property

[kingma-sbw]

I have a project where I want a message send by GET or POST propagat to my app. The reason is I want to show some sort of result. This is my index.php

<?php
$message = json_encode($_GET['message'] ?? "{}");
?>
...
  <div
    id="app"
    data-message="<?= $message ?>"
  >
  </div>

The problem is that this is rendered as

  <div
    id="app"
    data-message=""{}""
  >
  </div>

For some obscure reason. If I leave out "" in on the data-message property it gives a compile error.

How would I transmit a json object as app prop in PHP?

[donnikitos]

@kingma-sbw You’re running into this because you’re calling json_encode() on a string, not on an actual JSON-object.
Since $_GET['message'] is empty json_encode("{}") is being called, which results in "\"{}\"".

A solution would be to check $_GET['message'] first and depending on that encode it or return the JSON-Object:

<?php
$message = isset($_GET['message']) ? json_encode($_GET['message']) : "{}";
?>
...
  <div
    id="app"
    data-message="<?= $message ?>"
  >
  </div>