php - Sanitize POST content with HTML contents

I want to send HTML content by POST.

But when fetching it and sanitizing it it also cleans the HTML characters.

$Code = filter_var_array($value, FILTER_SANITIZE_STRING);

WHen I send :

I would like to Save this data

I receive :

I would like to Save this data

What should I change to create a safe string?

edit :
In my form I have a WYSIWYG editor (FCK Editor) and it's contents is where I am after.

Answer

I have used HTMLPurifier which is a PHP filter library to sanitize HTML input.

Basic usage is something like this;

include_once('/htmlpurifier/library/HTMLpurifier.auto.php');
$config = HTMLPurifier_Config::createDefault();
$purifier = new HTMLPurifier($config);
$clean['htmlData'] = $purifier->purify($_POST['htmlData']);