Can anyone take a look at this? (Yui editor)

I'm implementing YUI Rich Text Editor to my website and I'm having trouble getting the output to the database.

This is the page that the text is posted to from the editor html page...

<?php
include("../../../../../setup.php");
header('Content-Type: application/json');

/* yadl_spaceid - Skip Stamping */
include('exampleslib.inc');


// Use Services_JSON
require_once('JSON.php');
$json = new Services_JSON();

//Aggressive filtering...
$allow_tags = array(
    'b',
    'strong',
    'i',
    'em',
    'u',
    'a',
    'p',
    'sup',
    'sub',
    'div',
    'img',
    'span',
    'font',
    'br',
    'ul',
    'ol',
    'li'
);

$filter = $_POST['filter'];
$r_data = getRawEditorData('editor_data');
$e_data = strip_tags($r_data, '<'.implode('><', $allow_tags).'>'); //Example

if ($filter == 'yes') {
	// Replace the words:
    $EditorData = fudd($e_data);
    $EditorData .= '<br><br>--<br>Footer added on server side after filter'; 
} else {
    $EditorData = $e_data;
}

//Create the payload JSON object to deliver back to the browser..
$data = new stdclass();
$data->Results = new stdclass();
$data->Results->raw_data = $r_data;
$data->Results->filter = $filter;
$data->Results->status = 'OK';
$data->Results->data = $EditorData;


echo ($json->encode($data));



 
/*
 * Elmer Fudd filter code.
 * Plugin URI: http://dougal.gunters.org/blog/2004/08/30/text-filter-suite 
 * Author: Dougal Campbell
 * Author URI: http://dougal.gunters.org/
 */
function filter_cdata_content($content, $filter='none') {
	if (function_exists($filter)) {
		$content = preg_replace_callback('/(?(?<=>)|\A)([^<>]+)(?(?=<)|\Z)/s', $filter, $content);
	}

	return $content;
}

function fudd($content) {
	return filter_cdata_content($content,'fudd_filter');
}

function array_apply_regexp($patterns,$content) {
	// Extract the values:
	$keys = array_keys($patterns);
	$values = array_values($patterns);
	
	// Replace the words:
	$content = preg_replace($keys,$values,$content);

	return $content;
}

function fudd_filter($content) {
	$content = $content[1];

	$patterns = array(
			'%(r|l)%' => 'w',
			'%qu%' => 'qw',
			'%th(\s)%' => 'f$1',
			'%th%' => 'd',
			'%n\.%' => 'n, uh-hah-ha-ha.',
			'%(R|L)%' => 'W',
			'%(Qu|QW)%' => 'QW',
			'%TH(\s)%' => 'F$1',
			'%Th%' => 'D',
			'%N\.%' => 'N, uh-hah-hah-hah.'
			);

	$content = array_apply_regexp($patterns,$content);

	return $content;
}

?>

PHP:

This line seems to output the filtered text:

echo ($json->encode($data));


But it's not pure output, it has some weird stuff like "{"Results":{"raw_data":"blabla" and "","filter":null,"status":"OK","data":"" in there..

So I was wondering how would I get the filtered output into a variable? I don't understand class coding.