domdocument-sanitize-html.php

  <?php  
    /**
     * Sanitiza los HTML retirando script tags del codigo
     * @param $html string cadena HTML a sanitizar
     * @return string retorna cadena sanitizada
     */
    public static function sanitize_html($html){
        $dom = new DOMDocument();
        $dom->loadHTML($html);
        $script = $dom->getElementsByTagName('script');
        $remove = array();
        foreach($script as $key => $item) {
            $remove[$key] = $item;
        }
        foreach ($remove as $item) {
            $item->parentNode->removeChild($item);
        }

        $nodes = $dom->getElementsByTagName('*');
        foreach($nodes as $node) {
            if ($node->hasAttribute('onload')) {
                $node->removeAttribute('onload');
            }
            if ($node->hasAttribute('onclick'))  {
                $node->removeAttribute('onclick');
            }
            if ($node->hasAttribute('onfocus'))  {
                $node->removeAttribute('onfocus');
            }
            if ($node->hasAttribute('onblur'))  {
                $node->removeAttribute('onblur');
            }
            if ($node->hasAttribute('onchange'))  {
                $node->removeAttribute('onchange');
            }
            if ($node->hasAttribute('onkeyup'))  {
                $node->removeAttribute('onkeyup');
            }
            if ($node->hasAttribute('onkeydown'))  {
                $node->removeAttribute('onkeydown');
            }
            if ($node->hasAttribute('onkeypress'))  {
                $node->removeAttribute('onkeypress');
            }
            if ($node->hasAttribute('onmouseover'))  {
                $node->removeAttribute('onmouseover');
            }
            if ($node->hasAttribute('onmouseout'))  {
                $node->removeAttribute('onmouseout');
            }
            if ($node->hasAttribute('onmouseenter'))  {
                $node->removeAttribute('onmouseenter');
            }
            if ($node->hasAttribute('onmouseleave'))  {
                $node->removeAttribute('onmouseleave');
            }
            if ($node->hasAttribute('onmousemove'))  {
                $node->removeAttribute('onmousemove');
            }
            if ($node->hasAttribute('onmouseup'))  {
                $node->removeAttribute('onmouseup');
            }
            if ($node->hasAttribute('onmousedown'))  {
                $node->removeAttribute('onmousedown');
            }
            if ($node->hasAttribute('ondblclick'))  {
                $node->removeAttribute('ondblclick');
            }
            if ($node->hasAttribute('onreset'))  {
                $node->removeAttribute('onreset');
            }
            if ($node->hasAttribute('onselect'))  {
                $node->removeAttribute('onselect');
            }
            if ($node->hasAttribute('onsubmit'))  {
                $node->removeAttribute('onsubmit');
            }
            if ($node->hasAttribute('onerror'))  {
                $node->removeAttribute('onerror');
            }
            if ($node->hasAttribute('onscroll'))  {
                $node->removeAttribute('onscroll');
            }
            if ($node->hasAttribute('onunload'))  {
                $node->removeAttribute('onunload');
            }
        }
        return $dom->saveHTML();
    }