change all posted data in zend - zend-framework

Question

I want to apply this function to all posted data in zend frame work to prevent XSS attacks.
static function safe_against_xss($argument) {
$HtmlEntities_Filter = new Zend_Filter_HtmlEntities ( array ('quotestyle' => NULL, 'charset' => 'UTF-8' ) );
$argument = $HtmlEntities_Filter->filter ( $argument );
return $argument;
}
I use this code in my controller
$requests = $request->getPost() ;
foreach ($requests as $key => $value)
{
$requests[$key]=Functions::safe_against_xss($value);
}
It's worked,but i want to apply this function to all posted data in all controllers. automatically.
Sincerely

Answer 1

I write this codes:
$this->setRequest(Functions::safe_request($this->getRequest()));
In init of controllers
Then in Functions:
static function safe_against_xss($argument) {
// $HtmlEntities_Filter = new Zend_Filter_HtmlEntities ( NULL, 'UTF-8'
// );
$HtmlEntities_Filter = new Zend_Filter_HtmlEntities ( array ('quotestyle' => NULL, 'charset' => 'UTF-8' ) );
if (is_array($argument))
{
foreach($argument as $key => $value) {
$argument[$key] = $HtmlEntities_Filter->filter ( $value );
}
}
else
{
$argument = $HtmlEntities_Filter->filter ( $argument );
}
return $argument;
}
static function safe_post_params($params)
{
$safePostParams = array();
foreach($params as $key => $value) {
$safePostParams[$key] = self::safe_against_xss($value);
}
return $safePostParams;
}
static function safe_request($params)
{
$params->setParams(Functions::safe_post_params($params->getParams()));
$params->setPost(Functions::safe_post_params($params->getPost()));
return $params;
}