set('HTML.Doctype', 'HTML 4.01 Strict'); $config->set('HTML.Allowed', 'b,a[href],br'); $config->set('CSS.AllowTricky', true); $config->set('URI.Disable', true); $serial = $config->serialize(); $result = unserialize($serial); $purifier = new HTMLPurifier($result); echo htmlspecialchars($purifier->purify('Bold
no formatting'));