spellchecker plugin gives me Error: Missing input parameter 'text' - tinymce

Question

I'm trying to use TinyMCE's PHP Spellchecker 4.0 plugin but keep getting a Error: Missing input parameter 'text' error when I try to have it do any actual spell checking.
Here's my code:
<script type="text/javascript" src="tinymce/tinymce.min.js"></script>
<script type="text/javascript">
tinymce.init({
menubar:false,
statusbar:false,
selector: "textarea",
plugins: ["link","spellchecker"],
toolbar: "bold italic | numlist bullist | link unlink | spellchecker",
force_br_newlines: true,
force_p_newlines: false,
forced_root_block: '',
height: 300,
spellchecker_rpc_url: "spellchecker.php"
});
</script>
<textarea>tgis is misspelled text</textarea>
You can test it out live here:
http://www.frostjedi.com/terra/dev/tinymce/test.html
Here's a link to the version of the spellchecking program I'm using:
http://www.tinymce.com/wiki.php/PHP_Spellchecker
I used Wireshark to see what the above is sending over and it's this (via POST):
{"id":"c0","method":"spellcheck","params":{"lang":"en","words":["tgis","is","misspelled","text"]}}
And the response I'm getting:
{"error":"Missing input parameter 'text'."}
The response is correct - there is no input parameter named text. But I'd expect the javascript to add it if it was needed.
I tried doing <textarea name="text"> and <textarea id="text"> as well to no avail.
Any ideas?

Answer 1

The plugin is broken. As per my OP what it's posting is json encoded. And yet the PHP engine is expecting non-JSON encoded code. From spellchecker\includes\Engine.php:
$method = self::getParam("method", "spellcheck");
$lang = self::getParam("lang", "en_US");
$text = self::getParam("text");
Replacing that with this got it working for me:
global $HTTP_RAW_POST_DATA;
$data = json_decode($HTTP_RAW_POST_DATA);
$method = $data->method;
$lang = $data->params->lang;
$text = $data->params->words;
I think it's dumb that the plugin listed pretty prominently on their website doesn't work out of the box but whatever.