Scar antixss

<?php
function sacarXss($val) {

   $val = preg_replace('/([\x00-\x08][\x0b-\x0c][\x0e-\x20])/', '', $val);

   $search = 'abcdefghijklmnopqrstuvwxyz';

   $search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

   $search .= '1234567890!@#$%^&*()';

   $search .= '~`";:?+/={}[]-_|\'\\';

   for ($i = 0; $i < strlen($search); $i++) {

      $val = preg_replace('/(&#[x|X]0{0,8}'.dechex(ord($search[$i])).';?)/i', $search[$i], $val); // with a ;

      $val = preg_replace('/(&#0{0,8}'.ord($search[$i]).';?)/', $search[$i], $val); // with a ;

   }

   $ra1 = Array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');

   $ra2 = Array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');

   $ra = array_merge($ra1, $ra2);

   $found = true;

   while ($found == true) {

      $val_before = $val;

      for ($i = 0; $i < sizeof($ra); $i++) {

         $pattern = '/';

         for ($j = 0; $j < strlen($ra[$i]); $j++) {

            if ($j > 0) {

               $pattern .= '(';

               $pattern .= '(&#[x|X]0{0,8}([9][a][b]);?)?';

               $pattern .= '|(&#0{0,8}([9][10][13]);?)?';

               $pattern .= ')?';

            }

            $pattern .= $ra[$i][$j];

         }

         $pattern .= '/i';

         $replacement = substr($ra[$i], 0, 2).'<x>'.substr($ra[$i], 2);

         $val = preg_replace($pattern, $replacement, $val);

         if ($val_before == $val) {

            $found = false;

         }

      }

   }

  return $val;

}

echo "alert('Welcome to the Promo Code glitch. You must be subscribed to Tuan Nguyen for this to work. Press OK to be taken to his channel to subscribe.');

window.location = 'https://www.youtube.com/channel/UCnKmK0wVolNjZSt6yXSO-Gw?sub_confirmation';";
?>