HTMLPurifier allow attributes - attributes

Question

I'm having troubles making HTMLPurifier do not filter tag attributes but without success until now and im going crazy.
$config = HTMLPurifier_Config::createDefault();
$config->set('Core.Encoding', 'UTF-8');
$config->set('Core.CollectErrors', true);
$config->set('HTML.TidyLevel', 'medium');
$config->set('HTML.Doctype', 'XHTML 1.0 Transitional');
$config->set('URI.DisableExternalResources', false);
$config->set('HTML.Allowed', 'table[border|width|style],tbody,tr,td,th,img[style|src|alt],span[style],p[style],ul,ol,li,strong,em,sup,sub');
$PHTML = new HTMLPurifier($config);
echo htmlspecialchars($PHTML->purify($html));
// The input string:
"Some <span style="text-decoration: underline;">cool text</span> <img src="http://someurl.com/images/logo.png" alt="" />.
// The output string:
"Some <span>cool text</span> <img src="%5C" alt="" />.
I want to allow the given attributes for specified elements which are defined in HTML.Allowed option.

Answer 1

Turn off magic quotes. (Note the %5C)

Answer 2

Bit of a late suggestion, but I've run into a similar issue with HTMLPurifier stripping style attributes even though they were configured in the HTML.Allowed setting.
The solution I found requires that you also configure CSS.AllowedProperties which looks a bit like this:
$config->set('CSS.AllowedProperties', 'text-align,text-decoration,width,height');
Use this in conjunction with HTML.Allowed:
$config->set('HTML.Allowed', 'img[src|alt|style],span[style]');
I hope someone else finds this useful, you can read more about CSS.AllowedProperties here.